SeaSources.net, Training for Mariners. The First with Online Study for the Maritime Industry.

  Welcome to Seasources.net. Established in 1996, we are the ultimate source for online USCG exam preparation assistance. Seasources.net provides free online exam preparation along with downloadable studyguides and standalone software that allows you to continue your studies without an internet connection.

Prepare for or supplement your studies for your USCG license exam here.


                        Click here to register and begin your exam preparations with SeaSources.net

 

Hi! We have a new website! It's phone / tablet friendly and speedier. Please visit it today! 

All of the latest questions and illustrations on "Navigation General, Tides and Currents Questions " are in the Online Study.

Home Page

 

Tides and Currents

 

B A coastal current __________. is generated by waves striking the beach flows outside the surf zone is also known as a longshore current flows in a circular pattern Definitions
A On an Atlantic Ocean voyage from New York to Durban, South Africa, you should expect the Agulhas Current to present a strong __________. head current onshore set fair or following current offshore set Definitions
D As the South Equatorial Current approaches the east coast of Africa, it divides with the main part flowing south to form the warm __________. Benguela Current Madagascar Current Canary Current Agulhas Current Definitions
B In which month will the equatorial counter current be strongest? January August April October Definitions
A On a voyage from Cape Town to London, the favorable ocean current off the coast of Africa is the __________. Benguela Current Canary Current South Atlantic Current Agulhas Current Definitions
C The Benguela Current flows in a __________. SW'ly direction along the SE coast of Greenland S'ly direction off the East Coast of Australia NW'ly direction along the SW coast of Africa SW'ly direction along the NW coast of Africa Definitions
C Which current would you encounter on a direct passage from London, England, to Cape Town, South Africa? Falkland Current Brazil Current Benguela Current Norway Current Definitions
C The set of the equatorial countercurrent is generally to the __________. north southwest east northwest Definitions
D The Brazil Current flows in which general direction? Northwesterly Southeasterly Northerly Southwesterly Definitions
D What current flows southward along the west coast of the United States and causes extensive fog in that area? Alaska Current North Pacific Current Davidson Current California Current Definitions
B On a voyage from Halifax, N.S., to Dakar, West Africa, the Canary Current will __________. offer resistance in the form of a head current set the vessel to the right set the vessel to the left furnish additional thrust in the form of a fair or following current Definitions
B The speed of an ocean current is dependent on __________. underwater soil conditions the density of the water the presence of a high pressure area near it the air temperature Definitions
B The two most effective generating forces of surface ocean currents are __________. water depth and underwater topography wind and density differences in the water temperature and salinity differences in the water rotation of the Earth and continental interference Definitions
B Which statement(s) concerning the effect of Coriolis force on ocean currents is(are) correct? The deflection of the current is to the left in the Northern Hemisphere. The Coriolis force is more effective in deep water. The Coriolis force is greater in the lower latitudes. All of the above. Definitions
A The drift and set of tidal, river, and ocean currents refer to the __________. speed and direction toward which the current flows type and characteristic of the current's flow position and area of the current None of the above Definitions
B A tide is called diurnal when __________. the high tide and low tide are exactly six hours apart only one high and one low water occur during a lunar day two high tides occur during a lunar day the high tide is higher and the low tide is lower than usual Definitions
D The movement of water away from the shore or downstream is called a(n) __________. reversing current slack current flood current ebb current Definitions
D What describes an ebb current? Horizontal movement of the water away from the land following low tide Horizontal movement of the water toward the land following low tide Horizontal movement of the water toward the land following high tide Horizontal movement of the water away from the land following high tide Definitions
A What is an ebb current? A current going out A current coming in A current at minimum flow A current at maximum flow Definitions
C What describes a flood current? Horizontal movement of the water away from the land following high tide Horizontal movement of the water toward the land after high tide Horizontal movement of the water toward the land after low tide Horizontal movement of the water away from the land following low tide Definitions
B The term "flood current" refers to that time when the water __________. level is not changing is flowing towards the land is moving towards the ocean level is rising because of heavy rains Definitions
D In order to get the maximum benefit from the Gulf Stream, on a voyage between Houston and Philadelphia, you should navigate __________. about 10 miles east of Cape Canaveral, FL along the 50-fathom curve while off the east coast of Florida close inshore between Jupiter Inlet and Fowey Rocks, FL about 75 miles east of Ormond Beach, FL Definitions
A A swift current occurring in a narrow passage connecting two large bodies of water, which is produced by the continuously changing difference in height of tide at the two ends of the passage, is called a __________. hydraulic current rectilinear current harmonic current rotary current Definitions
D The current that, in many respects, is similar to the Gulf Stream is the __________. Oyashio Benguela Current California Current Kuroshio Definitions
A Which ocean current is "warm" based on the latitude in which it originates and on the effect it has on climate? Kuroshio Current Benguela Current Peru Current California Current Definitions
C The cold ocean current which meets the warm Gulf Stream between latitudes 40 and 43N to form the "cold wall" is called the __________. Greenland Current North Atlantic Current Labrador Current North Cape Current Definitions
B Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes? Iceland Current Labrador Current Baffin Current Baltic Current Definitions
A Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the __________. Oyashio Current Kuroshio Current Subarctic Current Alaska Current Definitions
D The Humboldt Current flows in which direction? South East West North Definitions
B The range of tide is the __________. maximum depth of the water at high tide difference between the heights of high and low tide distance the tide moves out from the shore duration of time between high and low tide Definitions
B The range of tide is the __________. duration of time between the high and low tide difference between the heights of high and low tide maximum depth of the water at high tide distance the tide moves out from the shore Definitions
C The range of tide is the __________. duration of time between high and low tide maximum depth of the water at high tide difference between the heights of high and low tide distance the tide moves out from the shore Definitions
A The range of tide is the __________. difference between the heights of high and low tide distance the tide moves out from the shore duration of time between high and low tide maximum depth of the water at high tide Definitions
C A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles, in a locale off the East coast of the US, is approximately __________. 3 1/2 hours 2 1/2 hours 12 1/2 hours 6 1/4 hours Definitions
C Which term refers to the direction a current is flowing? Drift Stand Set Vector direction Definitions
A Set of the current is __________. direction towards which it flows its velocity in knots estimated current direction from which it flows Definitions
A The set of the current is the __________. direction in which the current flows speed of the current at a particular time maximum speed of the current direction from which the current flows Definitions
A With respect to a reversing current, slack water occurs when there is __________. little or no horizontal motion of the water a weak ebb or flood current when winds cause water to back up in a river mouth little or no vertical motion of the water Definitions
A In a river subject to tidal currents, the best time to dock a ship without the assistance of tugs is __________. at slack water when there is a following current at high water at flood tide Definitions
B Which current would you encounter on a direct passage from southern Africa to Argentina, South America? South Equatorial South Atlantic Guinea Agulhas Definitions
A "Stand" of the tide is that time when __________. the vertical rise or fall of the tide has stopped slack water occurs tidal current is at a maximum the actual depth of the water equals the charted depth Definitions
A In the Sargasso Sea there are large quantities of seaweed and no well defined currents. This area is located in the __________. Central North Atlantic Ocean Caribbean Sea Western North Pacific Ocean area off the west coast of South America Definitions
A The north equatorial current flows to the __________. west northeast east southwest Definitions
C Which statement is TRUE concerning the current of the Gulf Stream? It is slower at the time of neap tides than at spring tides. It reaches its daily maximum speed a few hours before the transit of the Moon. Variations in the trade winds affect the current. When the Moon is at its maximum declination the stream is narrower than when the Moon is on the equator. Definitions
D The steady current circling the globe at about 60S is the __________. Humboldt Current Prevailing Westerly Sub-Polar Flow West Wind Drift Definitions
D The West Wind Drift is located __________. in the South Pacific near 5S on each side of the Equatorial Current in the North Atlantic between Greenland and Europe near 60S Definitions
C How long would a steady wind need to blow in order to create a wind driven current? 2 hours 6 hours 12 hours 18 hours Definitions
B You are on a voyage from New Orleans to Boston and navigating off the Florida coast. You will get the greatest benefit from the Gulf Stream if you navigate __________. about 15 miles east of Daytona about 20 miles east of Jupiter Inlet along the 50-fathom curve about 5 miles east of Cape Canaveral Definitions
D Ocean currents are well defined and __________. are characterized by a light green color change direction 360 during a 24 hour period create large waves in the direction of the current remain fairly constant in direction and velocity throughout the year Definitions
A The approximate mean position of the axis of the Gulf Stream east of Palm Beach, FL, is __________. 15 nautical miles 25 nautical miles 5 nautical miles 35 nautical miles Definitions
C Generally speaking, a ship steaming across the North Pacific from Japan to Seattle is likely to experience __________. adverse currents for practically the entire crossing favorable currents in the summer months and adverse currents in the winter months favorable currents for practically the entire crossing variable currents having no significant effect on the total steaming time Definitions
A In the Northern Hemisphere the major ocean currents tend to flow __________. clockwise around the North Atlantic and North Pacific Oceans counterclockwise except in the Gulf Stream clockwise or counterclockwise depending on whether it is warm or cold current counterclockwise around the North Atlantic and North Pacific Oceans Definitions
B You are on a voyage from New Orleans to Boston. When navigating off the Florida coast, you will get the greatest benefit from the Gulf Stream if you navigate __________. about 25 miles east of Daytona Beach about 45 miles east of Cape Canaveral close inshore between Fowey Rocks and Jupiter Inlet along the 50-fathom curve Definitions
C When a current flows in the opposite direction to the waves, the wave __________. velocity increases length is unchanged height is increased length is increased Definitions
B You are enroute to Jacksonville, FL, from San Juan, P.R. There is a fresh N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter __________. smoother seas and warmer water steeper waves, closer together long swells cirrus clouds Definitions
C You are enroute to Savannah, GA, from Recife, Brazil. There is a strong N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter __________. long swells smoother seas and warmer water steeper waves, closer together cirrus clouds Definitions
D You are bound for Baltimore via Cape Henry on a 15 knot ship. If the flood at Chesapeake Bay entrance begins at 1800 EST (ZD +5), at what time would you depart from the Chesapeake Bay entrance to have the most favorable current? 1700 hours 1800 hours 1900 hours 2030 hours Definitions
D Where will you find information about the duration of slack water? Sailing Directions American Practical Navigator Tide Tables Tidal Current Tables Definitions
C Where will you find information about the duration of slack water? Sailing Directions American Practical Navigator Tidal Current Tables Tide Tables Definitions
B You will find information about the duration of slack water in the __________. Tide Tables Tidal Current Tables Sailing Directions American Practical Navigator Definitions
B Information about the direction and velocity of rotary tidal currents is found in the __________. Mariner's Guide Tidal Current Tables Tide Tables Nautical Almanac Definitions
B Information about the direction and velocity of rotary tidal currents is found in the __________. Nautical Almanac Tidal Current Tables Mariner's Guide Tide Tables Definitions
D Information about the direction and velocity of rotary tidal currents is found in the __________. Tide Tables Mariner's Guide Nautical Almanac Tidal Current Tables Definitions
A Information about currents around Pacific Coast ports of the U.S. is found in the __________. Tidal Current Tables Tide Tables Nautical Almanac Ocean Current Tables Definitions
B Information about direction and velocity of rotary tidal currents is found in the __________. Nautical Almanac Tidal Current Tables Mariner's Guide Tide Tables Definitions
A Information about currents on the Pacific Coast of the U. S. are found in the __________. Tidal Current Tables Ocean Current Tables Nautical Almanac Tide Tables Definitions
B Information about currents on the Pacific Coast of the U. S. are found in the __________. Ocean Current Tables Tidal Current Tables Tide Tables Nautical Almanac Definitions
D Where can information about the currents for the Pacific Coast of the U. S. be obtained? Tide Tables Nautical Almanac Ocean Current Tables Tidal Current Tables Definitions
A Where would you find information concerning the duration of slack water? Tidal Current Tables Sailing Directions Tide Tables American Practical Navigator Definitions
D Data relating to the direction and velocity of rotary tidal currents can be found in the __________. Tide Tables Mariner's Guide Nautical Almanac Tidal Current Tables Definitions
D The velocity of the current in large coastal harbors is __________. unpredictable generally constant generally too weak to be of concern predicted in Tidal Current Tables Definitions
D How many slack tidal currents usually occur each day on the east coast of the United States? One Two Three Four Definitions
D To make sure of getting the full advantage of a favorable current, you should reach an entrance or strait at which time in relation to the predicted time of the favorable current? At the predicted time 30 minutes before flood, one hour after an ebb One hour after 30 minutes before Definitions
C When the declination of the Moon is 012.5'S, you can expect some tidal currents in Gulf Coast ports to __________. become reversing currents exceed the predicted velocities become weak and variable have either a double ebb or a double flood Definitions
C The velocity of a rotary tidal current will be decreased when the Moon is __________. full new at apogee All of the above. Definitions
D The velocity of a rotary tidal current will increase when the Moon is __________. at perigee full new All of the above. Definitions
B Where would you find information about the time of high tide at a specific location on a particular day of the year? Tidal Current Tables Tide Tables Coast Pilot Nautical Almanac Definitions
C To predict the actual depth of water using the Tide Tables, the number obtained from the Tide Tables is __________. divided by the charted depth multiplied by the charted depth added to or subtracted from the charted depth the actual depth Definitions
B When daylight savings time is kept, the time of tide and current calculations must be adjusted. One way of doing this is to __________. apply no correction as the times at the reference stations are adjusted for daylight savings time add one hour to the times listed for the reference stations subtract one hour from the times listed for the subordinate stations add 15 to the standard meridian when calculating the time differences Definitions
A When daylight savings time is kept, the time of tide and current calculations must be adjusted. One way of doing this is to __________. add one hour to the times listed under the reference stations apply no correction as the times in the reference stations are adjusted for daylight savings time add 15 to the standard meridian when calculating the time difference subtract one hour from the time differences listed for the subordinate stations Definitions
A When daylight savings time is kept, the time of tide and current calculations must be adjusted. One way of doing this is to __________. add one hour to the times listed under the reference stations apply no correction, as the times in the reference stations are adjusted for daylight savings time subtract one hour from the times listed under the reference stations add 15 to the standard meridian when calculating the time difference Definitions
A The time meridian used when computing the height of tide or the velocity of the current for Pensacola Bay, FL, is __________. 9000'W 9730'W 7500'W
8230'W Definitions
A The time meridian used for tide computations in New York Harbor is __________. 7500'W 5230'W 8230'W 6000'W Definitions
C The time meridian that is used when computing the currents for Pensacola Bay, Florida, is __________. 60W 75W 90W 105W Definitions
C The tides in Boston Harbor generally __________. have their variations caused by the changing declination of the Moon are diurnal in nature have a greater range than the tides in Gulf Coast ports All of the above. Definitions
B The datum from which the predicted heights of tides are reckoned in the tide tables is the same as that used for the charts of the locality. The depression of the datum below mean sea level for Hampton Roads, Virginia is __________. between -.7 and +.5 feet 1.2 feet 4.1 feet between 1.9 and 3.2 feet Definitions
B How many high waters usually occur each day on the East Coast of the United States? One Two Three Four Definitions
C The lunar or tidal day is __________. about 10 minutes longer than the solar day the same length as the solar day about 50 minutes longer than the solar day about 50 minutes shorter than the solar day Definitions
A Current refers to the __________. horizontal movement of the water vertical movement of the water density changes in the water None of the above Definitions
A In some river mouths and estuaries the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream, and is called a __________. bore seiche surge boundary wave Definitions
B Your vessel goes aground in soft mud. You would have the best chance of refloating it on the next tide if it grounded at __________. low water neap low water spring high water neap high water spring Definitions
C Spring tides occur __________. when the moon and sun have declination of the same name at the beginning of spring when the sun is over the equator when the moon is new or full only when the moon and sun are on the same sides of the earth Definitions
D When the moon is new or full, which type of tides occur? Neap Diurnal Apogean Spring Definitions
C Spring tides occur when the __________. Moon's declination is maximum and opposite to that of the Sun Sun and Moon are in quadrature Moon is new or full Moon is in its first quarter or third quarter phase Definitions
A Spring tides occur __________. when the Sun, Moon, and Earth are nearly in line, in any order at the start of spring, when the Sun is nearly over the equator when the Sun and Moon are at approximately 90 to each other as seen from the Earth only when the Sun and Moon are on the same side of the Earth and nearly in line Definitions
B When the moon is at first quarter or third quarter phase, what type of tides will occur? Spring Neap Perigean Apogean Definitions
C Neap tides occur only __________. at approximately 28-day intervals when the Sun, Moon, and Earth are in line when the Moon is at quadrature at a new or full Moon Definitions
B Neap tides occur __________. when the Sun, Moon, and Earth are nearly in line, regardless of alignment order when the Sun and Moon are at approximately 90 to each other, as seen from the Earth only when the Sun and Moon are on the same sides of the Earth and are nearly in line at the start of spring, when the Sun is nearly over the equator Definitions
B Neap tides occur when the __________. Sun and Moon are in conjunction Moon is in its first quarter and third quarter phases Sun and Moon are on opposite sides of the Earth Moon's declination is maximum and opposite to that of the Sun Definitions
A The class of tide that prevails in the greatest number of important harbors on the Atlantic Coast is __________. semidiurnal interval mixed diurnal Definitions
C In some parts of the world there is often a slight fall in tide during the middle of the high water period. The effect is to create a longer period of stand at higher water. This special feature is called a(n) __________. apogean tide bore double high water perigean tide Definitions
D An important lunar cycle affecting the tidal cycle is called the nodal period. How long is this cycle? 18 days 6 years 16 days 19 years Definitions
D Which statement is TRUE concerning apogean tides? They cause diurnal tides to become mixed. They occur when the Moon is nearest the Earth. They occur only at quadrature. They have a decreased range from normal. Definitions
B When the Moon's declination is maximum north, which of the following will occur? Equatorial tides Tropic tides Mixed-type tides Higher high tides and lower low tides Definitions
C Tropic tides are caused by the __________. Moon being at perigee Sun and Moon both being near 0 declination Moon being at its maximum declination Moon crossing the equator Definitions
B Which statement is TRUE concerning equatorial tides? They are used as the basis for the vulgar establishment of the port. The difference in height between consecutive high or low tides is at a minimum. They occur when the Moon is at maximum declination north or south. They occur when the Sun is at minimum declination north or south. Definitions
C Priming of the tides occurs __________. when the Earth, Moon, and Sun are lying approximately on the same line at times of new and full Moon when the Moon is between new and first quarter and between full and third quarter when the Moon is between first quarter and full and between third quarter and new Definitions
A What does the term "tide" refer to? Vertical movement of the water Horizontal movement of the water Salinity content of the water Mixing tendency of the water Definitions
A Mean low water is the average height of __________. all low waters high waters and low waters the surface of the sea the lower of the two daily low tides Definitions
D Mean high water is the average height of __________. the higher high waters the lower high waters the lower of the two daily tides all high waters Definitions
B The average height of the surface of the sea for all stages of the tide over a 19 year period is called __________. mean high water mean sea level mean low water half-tide level Definitions
D The diurnal inequality of the tides is caused by __________. the Moon being at apogee the Moon being at perigee changing weather conditions the declination of the Moon Definitions
D What is the definition of height of tide? The vertical difference between a datum plane and the ocean bottom The vertical distance from the surface of the water to the ocean floor The vertical difference between the heights of low and high water The vertical distance from the tidal datum to the level of the water at any time Definitions
C The height of tide is the __________. difference between the depth of the water and the high water tidal level depth of water at a specific time due to tidal effect difference between the depth of the water and the area's tidal datum difference between the depth of the water at high tide and the depth of the water at low tide Definitions
B The vertical distance from the tidal datum to the level of the water is the __________. actual water depth height of tide charted depth range of tide Definitions
C The distance between the surface of the water and the tidal datum is the __________. actual water depth range of tide height of tide charted depth Definitions
A The vertical distance from the tidal datum to the level of the water is the __________. height of tide charted depth range of tide actual water depth Definitions
C The distance between the surface of the water and the tidal datum is the __________. range of tide actual water depth height of tide charted depth Definitions
C What is the definition of height of tide? The vertical difference between the heights of low and high water The vertical distance from the surface of the water to the ocean floor The vertical distance from the tidal datum to the level of the water at any time The vertical difference between a datum plane and the ocean bottom Definitions
A The height of tide is the __________. difference between the depth of the water and the area's tidal datum difference between the depth of the water at high tide and the depth of the water at low tide depth of water at a specific time due to tidal effect difference between the depth of the water and the high water tidal level Definitions
D The difference between the heights of low and high tide is the __________. depth distance period range Definitions
A The difference between the heights of low and high tide is the __________. range distance period depth Definitions
C The difference between the heights of low and high tide is the __________. distance period range depth Definitions
C The difference between the heights of low and high tide is the __________. depth period range distance Definitions
B When there are small differences between the heights of two successive high tides or two low tides, in a tidal day, the tides are called __________. diurnal semidiurnal solar mixed Definitions
C Spring tides are tides that __________. occur in the spring of the year are unpredictable have lows lower than normal and highs higher than normal have lows higher than normal and highs lower than normal Definitions
B The point where the vertical rise or fall of tide has stopped is referred to as __________. the reverse of the tide the stand of the tide the rip tide slack water Definitions
B The period at high or low tide during which there is no change in the height of the water is called the __________. reversing of the tide stand of the tide plane of the tide range of the tide Definitions
C What will be the velocity of the tidal current at New London Harbor Entrance, CT, at 1615 EST (ZD +5) on 26 December 1983? 0.7 knot 0.9 knot 0.2 knot 0.4 knot Current Problems
C What will be the velocity and direction of the tidal current at Old Ferry Point, NY, at 1340 EST (ZD +5) on 5 February 1983? 1.0 knot at 076T 0.8 knot at 240T 1.4 knots at 076T 0.8 knot at 060T Current Problems
C What will be the velocity of the tidal current 6 miles south of Shoal Point, NY, at 1850 DST (ZD +4) on 9 July 1983? 0.2 knot ebb 1.2 knot ebb 0.2 knot flood 1.4 knot flood Current Problems
B What will be the velocity of the tidal current southwest of Hunts Point, NY, at 0932 EST (ZD +5) on 16 March 1983? 0.9 knot 1.5 knots 1.8 knots 2.3 knots Current Problems
C What will be the velocity and direction of the tidal current at Mobile River Entrance, AL, at 0915 CDT (ZD +5) on 13 May 1983? 0.7 knot at 151T 0.1 knot at 333T 0.3 knot at 333T 1.8 knots at 025T Current Problems
D What is the velocity of the tidal current at the east end of Pollock Rip Channel at 1700 DST (ZD +4) on 23 July 1983? 0.6 knot ebbing 0.8 knot flooding 1.9 knots flooding 1.5 knots flooding Current Problems
D You will be entering the Mystic River in Connecticut. What is the current at the Highway Bridge at 1900 EST (ZD +5) on 24 January 1983? 2.5 knots ebbing 2.2 knots flooding Slack water Slight ebb Current Problems
D What will be the velocity of the tidal current at Port Jefferson Harbor Entrance, NY, at 1600 EST (ZD +5) on 23 December 1983? 2.0 knots 1.6 knots 0.9 knot 1.1 knots Current Problems
D What will be the velocity of the tidal current south of Doubling Point, ME, at 1357 EST (ZD +5) on 3 April 1983? 2.6 knots 1.3 knots 0.9 knot 2.0 knots Current Problems
B What will be the direction and velocity of the tidal current at Provincetown Harbor, MA, at 1405 DST (ZD +4) on 5 May 1983? 0.0 knot at 135T 0.4 knot at 315T 0.2 knot at 135T 0.6 knot at 315T Current Problems
B What will be the velocity of the tidal current in Bolivar Roads, Texas, at a point 0.5 mile north of Ft. Point, on 23 November 1983 at 0330 CST (ZD +6)? 0.8 kt Slack water 3.4 kts 1.2 kts Current Problems
D What will be the velocity of the tidal current at Grant's Tomb, 123rd Street, NY, NY, at 1412 EST (ZD +5) on 22 March 1983? 0.5 knot 1.3 knots 0.8 knot 1.1 knots Current Problems
D What will be the velocity of the tidal current at 0.2 mile SSW of Clason Point, NY, at 1125 on 17 April 1983? 0.5 knot 1.9 knots 0.8 knot 1.1 knots Current Problems
B What will be the velocity of the tidal current at Port Royal, VA, at 1505 DST (ZD +4) on 4 June 1983? 0.0 knot 0.4 knot 0.7 knot 0.1 knot Current Problems
C What is the predicted velocity of the tidal current 2 miles west of Southwest Ledge for 2330 DST (ZD +4) on 7 September 1983? 1.6 knots 2.2 knots 1.3 knots 1.9 knots Current Problems
C What will be the velocity of the tidal current 1.0 mile southwest of Lewis Pt., RI, at 1501 EST (ZD +5) on 4 April 1983? 1.4 knots 1.6 knots 0.7 knot 1.9 knots Current Problems
B What will be the velocity of the tidal current at Coxsackie, NY, at 0945 EST (ZD +5) on 11 March 1983? 0.3 knot 0.7 knot 1.2 knots 1.9 knots Current Problems
B What will the velocity and direction of the tidal current be at Port Morris, NY, at 1135 DST (ZD +4) on 13 May 1983? 3.1 knots at 045T negligible at 220T 1.2 knots at 220T 1.0 knot at 045T Current Problems
C What will be the velocity of the tidal current 4.5 miles east of Smith Point, VA, at 0630 DST (ZD +4) on 6 May 1983? 1.0 knot 0.5 knot 0.3 knot 0.7 knot Current Problems
B What will be the velocity of the tidal current at Bournedale, MA, at 1135 DST (ZD +4) on 3 May 1983? 1.1 knots 3.0 knots 2.3 knots 3.6 knots Current Problems
B What will be the time of maximum flood current at Sagamore Bridge on the Cape Cod Canal during the morning of 6 December 1983 (ZD +5)? 1020 0708 0716 0712 Current Problems
A You are bound for the Chelsea docks in the Hudson River. The Captain wants to arrive at the docks at the first slack water on 28 July 1983. You are keeping daylight saving time. What time should you be at the docks? 0215 0911 0811 0530 Current Problems
C You are on a coastwise voyage bound for Marcus Hook, PA. Your speed is 15 knots. You wish to use the flood tide to facilitate docking starboard side to, heading seaward. To have the most favorable tide throughout, you should time your arrival at the entrance to Delaware Bay __________. for 1 hour before flood begins for 1 hour after flood begins for 3 hours after flood begins for 1 hour before ebb begins Current Problems
A Your vessel is off Barnegat, NJ with the wind coming out of the east. What will be the approximate direction of the wind-driven current? 254 106 016 286 Current Problems
B Your vessel is off Fire Island, NY with winds from the southwest. What will be the approximate direction of the wind-driven current? 014 076 170 256 Current Problems
A Your vessel is at the approaches to Savannah, GA, with the wind coming out of the west. What will be the approximate direction of the wind-driven current? 080 280 100 260 Current Problems
C The moon is full and at perigee on 20 January 1983. What is the maximum current you could expect at 2350 (ZD +5) at Nantucket Shoals? 0.7 knot 0.5 knot 1.0 knot 0.8 knot Current Problems, 2nd Mate-chief Mate
A You are at anchor in the anchorage at the entrance to Delaware Bay. You weigh anchor at 1445 DST (ZD +4) on 24 July 1983 and proceed northbound enroute to Philadelphia at a speed of 10 knots. Which of the following should you expect to experience? a weak flood between Reedy Island and Edgemoor an ebb current north of New Castle, DE a flood current from Ship John Shoal Lt. to Philadelphia a flood current the entire trip Current Problems, 2nd Mate-chief Mate
B You get underway from the oil terminal at Marcus Hook, PA, at 0815 ZT (ZD +5) on 20 February 1983, enroute to sea. You will be turning for 11 knots. What is the approximate current when you are abreast Reedy Island? 1.5 knots flooding 2.0 knots ebbing 0.5 knot flooding Slack Current Problems, 2nd Mate-chief Mate
B You get underway from the shipyard in Chester, PA, at 1515 DST (ZD +4) on 6 August 1983, enroute to sea. You will be turning for eight knots. What current can you expect at Fourteen Foot Bank Light? 0.5 knot ebbing 1.3 knots ebbing Slack 1.7 knots ebbing Current Problems, 2nd Mate-chief Mate
A You want to transit Pollock Rip Channel, MA, on 6 April 1983. What is the period of time around the 0955 (ZD +5) slack in which the current does not exceed 0.3 knot? 0935 to 1017 0955 to 1044 0940 to 1010 0911 to 0955 Current Problems, 2nd Mate-chief Mate
D You want to transit Hell Gate, NY on 23 July 1983. What is the period of time around the AM (ZD +4) slack before ebb when the current will be less than 0.3 knot? 0348 to 0356 0844 to 0852 0939 to 0957 0943 to 0953 Current Problems, 2nd Mate-chief Mate
B You will transit the Cape Cod Canal on 7 November 1983. If you arrive at the R R Bridge at 1655 EST (ZD +5), for what period of time during your transit will you have currents of not more than 0.5 knot? 1655 to 1709 1648 to 1702 1638 to 1655 1631 to 1719 Current Problems, 2nd Mate-chief Mate
A You want to transit Hell Gate on 23 July 1983. What is the period of time around the AM (ZD +4) slack before ebb when the current will be less than 0.5 knot? 0939 to 0957 0943 to 0953 0844 to 0852 0348 to 0356 Current Problems, 2nd Mate-chief Mate
C Determine the first time after 1200 EST (ZD +5) when the velocity of the current will be 0.5 knot on 18 November 1983, at Marcus Hook, PA. 1226 1221 1239 1312 Current Problems, 2nd Mate-chief Mate
C What is the period of time from around 1008 DST (ZD +4) at Canapitsit Channel, MA, on 7 August 1983, in which the current does not exceed 0.4 knot? 1000 to 1024 0945 to 1031 0955 to 1021 0950 to 1026 Current Problems, 2nd Mate-chief Mate
C Determine the time after 0730 EST (ZD +5) when the velocity of the current will be 2.1 knots on 26 March 1983, at Fort Pulaski, GA. 0802 0821 0840 0812 Current Problems, 2nd Mate-chief Mate
C Determine the duration of the first PM slack water on 3 March 1983, east of the Statue of Liberty, when the current is less than 0.1 knot. 19 minutes 10 minutes 13 minutes 16 minutes Current Problems, 2nd Mate-chief Mate
A Determine the time after 0300 CST (ZD +6) when the velocity of the tidal current will be 0.5 knot on 16 April 1983, at Port Arthur Canal Entrance, TX. 0507 0554 0538 0436 Current Problems, 2nd Mate-chief Mate
C The predicted time that the ebb begins at the entrance to Delaware Bay is 1526. You are anchored off Chestnut St. in Philadelphia. If you get underway bound for sea at 1630 and turn for 12 knots, at what point will you lose the flood current? Reedy Island Ship John Shoal Lt. New Castle Mile 44 Current Problems, 2nd Mate-chief Mate
A The predicted time that the flood begins at the entrance to Delaware Bay is 1526. You are anchored off Chestnut St. in Philadelphia. If you get underway bound for sea at 1430 and turn for 11 knots, at what point will you lose the ebb current? Liston Pt. Ship John Shoal Lt. New Castle Arnold Pt. Current Problems, 2nd Mate-chief Mate
A The predicted time that the flood begins at the entrance to Delaware Bay is 1526. You are anchored off Chestnut St. in Philadelphia. If you get underway bound for sea at 1600 and turn for 8 knots, at what point will you lose the ebb current? Mile 63 Marcus Hook Billingsport Mile 52 Current Problems, 2nd Mate-chief Mate
A The predicted time that the flood begins at the entrance to Delaware Bay is 1526. You are anchored off Chestnut St. in Philadelphia. If you get underway bound for sea at 1300 and turn for 13 knots, at what point will you lose the flood current? Billingsport Marcus Hook New Castle Mile 52 Current Problems, 2nd Mate-chief Mate
B What will be the set of the rotary current at Nantucket Shoals at 1245 (ZD +5) 14 January 1983? 162 125 015 225 Current Problems, 2nd Mate-chief Mate
D The wind at Frying Pan shoals has been south-southwesterly at an average velocity of 30 mph. The predicted set and drift of the rotary current are 232 at 0.8 knot. What current should you expect? 092 at 1.3 knots 065 at 1.2 knots 139 at 0.6 knot 224 at 0.4 knot Current Problems, 2nd Mate-chief Mate
D The wind in the vicinity of Nantucket Shoals Light has been southerly at an average speed of 23 mph. The predicted set and drift of the rotary current is 225 at 0.8 knot. What current should you expect? 218 at 1.1 knots 247 at 0.7 knot 025 at 1.8 knots 235 at 0.5 knot Current Problems, 2nd Mate-chief Mate
A The wind at Frying Pan shoals has been west-northwesterly at an average velocity of 40 mph. The predicted set and drift of the rotary current are 323 at 0.6 knot. What current should you expect? 018 at 0.4 knot 052 at 0.6 knot 089 at 0.9 knot 001 at 0.7 knot Current Problems, 2nd Mate-chief Mate
D The wind at Frying Pan shoals has been north-northeasterly at an average velocity of 30 mph. The predicted set and drift of the rotary current are 355 at 0.8 knot. What current should you expect? 010 at 1.1 knots 047 at 0.3 knot 279 at 1.0 knot 325 at 0.7 knot Current Problems, 2nd Mate-chief Mate
A The wind at Frying Pan shoals has been northwesterly at an average velocity of 22 mph. The predicted set and drift of the rotary current are 125 at 0.6 knot. What current should you expect? 119 at 0.9 knot 225 at 0.6 knot 340 at 0.4 knot 172 at 1.1 knots Current Problems, 2nd Mate-chief Mate
B At what time after 1400 EST (ZD +5), on 4 January 1983, will the height of the tide at Port Wentworth, GA, be 3.0 feet? 1630 1653 1612 1718 Tide Problems
C Determine the height of the tide at 1430 EST (ZD +5) at New Bedford, MA, on 10 April 1983. 1.2 feet 1.1 feet 1.4 feet 1.7 feet Tide Problems
D Determine the height of the tide at 2045 EST (ZD +5) at Augusta, ME, on 8 March 1983. 2.6 feet (0.8 meter) 1.4 feet (0.5 meter) 2.3 feet (0.7 meter) 1.9 feet (0.6 meter) Tide Problems
C Find the height of the tide at Port Wentworth, GA, on 5 October 1983, at 1840 DST (ZD +4). 4.0 feet 3.5 feet 4.4 feet 3.0 feet Tide Problems
D For 3 November 1983, at 0830 EST (ZD +5) at Catskill, NY, what is the predicted height of tide? -1.3 feet (-0.4 m) +0.9 foot (+0.3 m) +0.1 foot (+0.0 m) -0.6 foot (-0.2 m) Tide Problems
A On 10 August 1983 you will dock near Days Point, Weehawken, on the Hudson River, at 1800 DST (ZD +4). The charted depth alongside the pier is 24 feet (7.3 meters). What will be the depth of water when you dock? 23.9 feet (7.2 m) 26.3 feet (8.0 m) 23.5 feet (7.1 m) 24.9 feet (7.5 m) Tide Problems
C On 2 November 1983, at 1630 EST (ZD +5), what will be the predicted height of tide at Fulton, FL? 5.6 feet (1.7 meters) 3.4 feet (1.0 meters) 2.8 feet (0.8 meters) 4.2 feet (1.3 meters) Tide Problems
B On 23 March 1983, at Kingston Point, NY, what is the earliest time after 1700 EST (ZD +5) that the predicted tide will be +2.0 feet? 2030 1854 1730 1800 Tide Problems
D On 26 February 1983, at 1750 EST (ZD +5) what will be the predicted height of tide at New Haven (city dock), CT? 1.6 feet (0.5 meter) -.3 foot (-0.1 meter) 1.3 feet (0.4 meter) -.6 foot (-0.2 meter) Tide Problems
D On 27 April 1983, at 1105 DST (ZD +4), what will be the predicted height of tide at Falkner Island, CT? 6.2 feet (1.9 m) 5.6 feet (1.7 m) 6.8 feet (2.7 m) 5.3 feet (1.6 m) Tide Problems
D On 5 March 1983, at 0630 EST (ZD +5), what will be the predicted height of tide at Ocracoke, Ocracoke Inlet, NC? 2.3 feet 1.2 feet 1.9 feet 0.1 foot Tide Problems
A On 6 July 1983, at 1520 DST (ZD +4) what will be the predicted height of tide at Newburgh, NY? 0.6 foot 1.2 feet 1.7 feet 2.1 feet Tide Problems
D On 6 July 1983, at 1830 DST (ZD +4), what will be the predicted height of tide at Newburgh, NY? 2.6 feet 2.4 feet 3.3 feet 2.0 feet Tide Problems
B On 6 June 1983, at 1719 EST (ZD +5), what will be the predicted height of tide at Chester, PA? 0.8 feet( 0.2 meters) 1.1 feet (0.3 meters) 4.7 feet (1.4 meters) 3.5 feet (1.1 meters) Tide Problems
C The mean tide level at Peaks Island, ME, is __________. 3.2 feet (1.0 meters) 2.5 feet (0.8 meters) 4.5 feet (1.4 meters) 1.8 feet (0.5 meters) Tide Problems
A What will be the height of tide at Gargathy Neck, VA, at 1800 DST (ZD +4), on 16 August 1983? 2.9 feet 2.3 feet 3.6 feet 3.3 feet Tide Problems
C What will be the height of tide at Three Mile Harbor Entrance, Gardiners Bay, NY, at 0700 (ZD +5) on 14 Nov 1983? 1.1 feet (0.3 meters) 2.2 feet (0.7 meters) 1.7 feet (0.5 meters) 1.9 feet (0.6 meters) Tide Problems
A What will be the time (ZD +5) of the second high tide at Weymouth Fore River Bridge, MA, on 12 November 1983? 1650 1643 1647 1639 Tide Problems
B What will be the time after 0300 (ZD +4), on 5 March 1983, when the height of the tide at Port of Spain, Trinidad, will be 2.5 feet (.76 meters)? 0618 0602 0634 0548 Tide Problems
C What will be the time after 0600 (ZD +3), on 6 March 1983, that the height of the tide at Puerto Rosales, Argentina, will be 9.0 feet (2.7 meters)? 0754 0740 0922 0840 Tide Problems
D What will be the time after 0800 EST (ZD +5) that the height of the tide at South Freeport, ME, will be 6.0 feet (1.8 meters) on 7 November 1983? 942 936 1001 951 Tide Problems
C What will be the time after 1000 EST (ZD +5), on 4 March 1983, that the height of the tide at City Island, NY, will be 2.4 feet? 1240 1248 1228 1244 Tide Problems
B What would be the height of the tide at Crisfield, MD, at 0310 DST (ZD +4) on 6 May 1983? 1.1 feet 0.5 foot 1.6 feet 0.1 foot Tide Problems
D Your vessel will be docking at Chester, PA, during the evening of 22 April 1983. The chart shows a depth of 20 feet (6.1 meters) at the pier. What will be the depth of water available at 1856 EST (ZD +5)? 22.4 feet (6.8 meters) 24.9 feet (7.6 meters) 25.7 feet (7.8 meters) 23.4 feet (7.2 meters) Tide Problems
C Your vessel will be docking at Chester, PA, during the evening of 22 April 1983. The chart shows a depth of 20 feet (6.1 meters) at the pier. What will be the depth of water available at 2310 EST (ZD +5)? 25.8 feet (7.9 meters). 20.8 feet (6.3 meters) 24.7 feet (7.5 meters) 19.2 feet (5.9 meters) Tide Problems
A If the height of the tide at low water is 0.0 feet, the range is 9.0 feet, and the duration is 06h 00m. What is the height of the tide 02h 12m before high water ? 6.3 feet 8.3 feet 2.7 feet 4.7 feet Tide Problems
C The charted channel depth at Eastport, ME, is 28 feet. You are drawing 31.5 feet and wish 2 feet clearance under the keel. What is the earliest time after 1700 (ZD +4) on 6 September 1983 that you can enter the channel? 2003 1825 1915 1903 Tide Problems, 2nd Mate-chief Mate
D The charted depth alongside the south face of Mystic Pier, Charlestown, MA, is 35 feet. Your maximum draft is 38 feet. You wish to have 2 feet under the bottom, on a rising tide, when you go alongside to discharge a heavy lift. What is the earliest time after 0900 EST (ZD +5), on 2 February 1983, that you can dock? 1050 1020 1127 1137 Tide Problems, 2nd Mate-chief Mate
A You are to sail from Elizabethport, N.J., on 17 November 1983 with a maximum draft of 27 feet. You will pass over an obstruction in the channel near Sandy Hook that has a charted depth of 25.5 feet. The steaming time from Elizabethport to the obstruction is 1h 50m. What is the earliest time (ZD +5) you can sail on 17 November and pass over the obstruction with 2 feet of clearance? 121 0059 0159 0221 Tide Problems, 2nd Mate-chief Mate
C You are to sail from Elizabethport, N.J., on 22 May 1983, with a maximum draft of 28 feet. You will pass over an obstruction in the channel near Sandy Hook that has a depth of 26.5 feet. The steaming time from Elizabethport to the obstruction is 1h 40m. What is the earliest time (ZD + 4) you can sail on the afternoon of 22 May and pass over the obstruction with 2 feet of clearance? 1424 1454 1342 1405 Tide Problems, 2nd Mate-chief Mate
D You are to sail from Elizabethport, NJ, on 17 November 1983 with a maximum draft of 27 feet. You will pass over an obstruction in the channel near Sandy Hook that has a charted depth of 26 feet. The steaming time from Elizabethport to the obstruction is 1h 50m. What is the earliest time (ZD +5) you can sail on 17 November and pass over the obstruction with 2 feet of clearance? 124 0218 0154 0056 Tide Problems, 2nd Mate-chief Mate
A You are to sail from Elizabethport, NJ, on 22 May 1983 with a maximum draft of 28 feet. You will pass over an obstruction in the channel near Sandy Hook that has a charted depth of 27 feet. The steaming time from Elizabethport to the obstruction is 1h 40m. What is the earliest time (ZD +4) you can sail on the afternoon of 22 May and pass over the obstruction with 3 feet of clearance? 1407 1331 1303 1242 Tide Problems, 2nd Mate-chief Mate
C You will be loading in Boston Harbor to a maximum draft of 32'06". The charted depth of an obstruction in the channel near Boston Light is 30 feet and you wish to have 3 feet of keel clearance. The steaming time from the pier to the obstruction is 01h 05m. What is the latest time (ZD +4) you can sail on 17 May 1983 and meet these requirements? 2350 1821 1728 1610 Tide Problems, 2nd Mate-chief Mate
B Your draft is 24 feet. You wish to pass over an obstruction near Lovell Island, MA, on 6 May 1983. The charted depth is 22 feet. Allowing a safety margin of 3.0 feet, what is the earliest time after 0200 DST (ZD +4) that this passage can be made? 215 0347 0310 0245 Tide Problems, 2nd Mate-chief Mate
A Your vessel has a draft of 23 feet. On 23 June 1983 you wish to pass over a temporary obstruction near Beaufort, SC, that has a charted depth of 22 feet. Allowing for a safety margin of 3 feet, what is the earliest time after 1600 DST (ZD +4) that this passage can be made? 1750 1855 1815 1944 Tide Problems, 2nd Mate-chief Mate
D Your vessel has a draft of 24 feet. On 7 April 1983 you wish to pass over a temporary obstruction near Lovell Island, MA, that has a charted depth of 22 feet. Allowing for a safety margin of 3.1 feet under your keel, what is the earliest time after 0100 EST (ZD +5) that this passage can be made? 304 0248 0356 0342 Tide Problems, 2nd Mate-chief Mate
C Your vessel has a draft of 34 feet. On 8 October 1983 you wish to pass over an obstruction near Jaffrey Point, NH, that has a charted depth of 31 feet. Allowing for a safety margin of 3 feet, what is the earliest time after 0900 DST (ZD +4) that this passage can be made? 1159 0920 1029 1120 Tide Problems, 2nd Mate-chief Mate