USCG General Navigation: Master's License

This is an interactive test. Read each question and select the proper answer by clicking on the appropriate answer. If a "Y" appears, your choice is correct. If a "N" appears, more study may be in order.

94: When using a recording depth finder in the open ocean, what phenomena is most likely to produce a continuous trace that may not be from the actual ocean bottom?

101: A lighted preferred-channel buoy may show a __________.

211: The light rhythm of Morse (A) is shown on __________.

217: 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) __________.

    N a. apogean tide
    Y b. double high water
    N c. perigean tide
    N d. bore

275: Which statement concerning illustration is correct? (Soundings and heights are in meters) (D010NG )

    Y a. The sunken wreck southwest of Beito Island shows the hull or superstructure above the sounding datum.
    N b. There is a 12-meter deep hole inside the 5-meter curve just west of Beito Island.
    N c. The position of the lightship is indicated by the center of the star on the symbol's mast.
    N d. Maury Lightship swings about her anchor on a circle with a 21-meter diameter.

298: A great circle crosses the equator at 173E. It will also cross the equator at what other longitude?

    Y a. 7W
    N b. 73E
    N c. 73W
    N d. 173W

339: The wind at Frying Pan shoals has been north-northeasterly at an average velocity of 30 knots. The predicted set and drift of the rotary current are 355 at 0.8 knot. What current should you expect?

    N a. 010 at 1.1 knots
    N b. 047 at 0.3 knot
    Y c. 325 at 0.7 knot
    N d. 279 at 1.0 knot

370: Prevailing winds between 30N and 60N latitude are from the __________.

    N a. north
    N b. south
    N c. east
    Y d. west

384: Which is a nonadjustable error of the sextant?

    N a. Error of perpendicularity
    N b. Side error
    N c. Error of collimation
    Y d. Centering error

388: You are underway on course 120T and your maximum speed is 12 knots. The eye of a hurricane bears 150T, 120 miles from your position. The hurricane is moving towards 295T at 20 knots. If you maneuver at 12 knots to avoid the hurricane, what could be the maximum CPA?

    N a. 89 miles
    N b. 96 miles
    N c. 105 miles
    Y d. 117 miles

388: You are underway on course 120T and your maximum speed is 12 knots. The eye of a hurricane bears 150T, 120 miles from your position. The hurricane is moving towards 295T at 20 knots. If you maneuver at 12 knots to avoid the hurricane, what could be the maximum CPA?

    N a. 89 miles
    N b. 96 miles
    N c. 105 miles
    Y d. 117 miles

394: An instrument designed to maintain a continuous record of atmospheric pressure is a(n) __________.

    N a. mercurial barometer
    N b. aneroid barometer
    Y c. barograph
    N d. thermograph

411: When entering from seaward, a buoy displaying a single-flashing red light would indicate __________.

    N a. a junction with the preferred channel to the left
    N b. a sharp turn in the channel to the right
    Y c. the starboard side of the channel
    N d. a wreck to be left on the vessel's port side

436: A wind vane on a moving vessel shows __________.

    N a. dead reckoning wind direction
    N b. true wind direction
    Y c. apparent wind direction
    N d. estimated wind direction

484: The needle of an aneroid barometer points to 30.05 on the dial. This indicates that the barometric pressure is __________.

    Y a. 30.05 inches of mercury
    N b. 30.05 millimeters of mercury
    N c. 30.05 millibars
    N d. falling

497: 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) ?

    N a. 0548
    Y b. 0602
    N c. 0618
    N d. 0634

517: On 5 March 1983, at 0630 EST (ZD +5), what will be the predicted height of tide at Ocracoke, Ocracoke Inlet, NC?

    Y a. 0.1 foot
    N b. 1.2 feet
    N c. 1.9 feet
    N d. 2.3 feet

614: A marine chronometer should be rewound once every __________.

    N a. 12 hours
    Y b. day
    N c. 3 days
    N d. week

710: What is the FIRST sign of the existence of a well developed tropical cyclone?

    N a. Gale force winds from the north
    Y b. An unusually long ocean swell
    N c. Steep, short-period waves and light wind
    N d. Thunderstorms and higher than usual humidity

717: Which term refers to the direction a current is flowing?

    Y a. Set
    N b. Drift
    N c. Vector direction
    N d. Stand

723: If there is any doubt as to the proper operation of a radar, which statement is TRUE?

    N a. Only a radar expert can determine if the radar is operating.
    N b. All radars have indicator lights and alarms to signal improper operation.
    Y c. A radar range compared to the actual range of a known object can be used to check the operation of the radar.
    N d. The radar resolution detector must be energized to check the radar.

730: In the Northern Hemisphere, the largest waves or swells created by a typhoon or hurricane will be located __________.

    N a. in the southeast quadrant of the storm
    N b. directly behind the storm center
    Y c. forward and to the right of its course
    N d. behind and to the left of its course

796: Cyclones tend to move __________.

    N a. perpendicular to the isobars in their warm sectors
    Y b. parallel to the isobars in their warm sectors
    N c. parallel to the line of the cold front
    N d. perpendicular to the line of the cold front

884: Which cloud type is normally associated with thunderstorms?

    N a. Cirrus
    N b. Stratus
    N c. Cumulus
    Y d. Cumulonimbus

888: Recurvature of a hurricane's track usually results in the forward speed __________.

    Y a. increasing
    N b. decreasing
    N c. remaining the same
    N d. varying during the day

906: In the Northern Hemisphere, an area of counterclockwise wind circulation surrounded by higher pressure is a __________.

    Y a. low
    N b. high
    N c. warm front
    N d. cold front

937: The north equatorial current flows to the __________.

    N a. east
    N b. northeast
    N c. southwest
    Y d. west

958: You are preparing a weather report form. Twenty-five percent of the sky is covered with clouds, and the anemometer indicates that the apparent wind is from 062 relative at 13 knots. You are on course 238T at 22 knots. How should you encode group Nddff? (D041NG )

    Y a. 20220
    N b. 20613
    N c. 30219
    N d. 32413

980: When the declination of the Moon is 012.5'S, you can expect some tidal currents in Gulf Coast ports to __________.

    N a. have either a double ebb or a double flood
    Y b. become weak and variable
    N c. become reversing currents
    N d. exceed the predicted velocities

1031: While steaming north of the Irish coast, you sight a buoy which shows the light rhythm shown in illustration D028NG. How would you pass this buoy? (D028NG )

    N a. North of the buoy
    Y b. East of the buoy
    N c. South of the buoy
    N d. West of the buoy

1142: Which weather conditions would you expect to find 100 miles East of position "B"? (D049NG )

    N a. Winds NW at 20.5 knots, steady warm temperature, high seas
    N b. Winds calm, falling temperature, clear skies, high seas
    Y c. Winds WSW, steady temperature, scattered clouds, moderate seas
    N d. None of the above

1233: Deviation is the angle between the __________.

    N a. true meridian and the axis of the compass card
    N b. true meridian and the magnetic meridian
    Y c. magnetic meridian and the axis of the compass card
    N d. axis of the compass card and the degaussing meridian

1252: Port side daymarks may be __________.

    Y a. numbered
    N b. octagonal
    N c. black and white
    N d. of any shape

1278: The difference between the heights of low and high tide is the __________.

    N a. depth
    N b. distance
    Y c. range
    N d. period

1343: Variation is a compass error that you __________.

    N a. can correct by adjusting the compass card
    N b. can correct by adjusting the compensating magnets
    N c. can correct by changing the vessel's heading
    Y d. cannot correct

1402: As a vessel changes course to starboard, the compass card in a magnetic compass __________.

    N a. first turns to starboard then counterclockwise to port
    N b. also turns to starboard
    N c. turns counterclockwise to port
    Y d. remains aligned with compass north

1434: What is NOT a characteristic of cardinal marks?

    N a. Yellow and black bands
    N b. White lights
    Y c. Square or triangular topmarks
    N d. Directional orientation to a hazard

1466: Advection fog is most commonly caused by __________.

    N a. air being warmed above the dew point
    N b. saturation of cold air by rain
    N c. a rapid cooling of the air near the surface of the Earth at night
    Y d. warm moist air being blown over a colder surface

1540: You are sailing south on the Intracoastal Waterway (ICW) when you sight a green can buoy with a yellow square painted on it. Which of the following is TRUE?

    N a. You should pass the buoy close aboard on either side.
    N b. The buoy marks the end of the ICW in that area.
    Y c. You should leave the buoy to port.
    N d. The yellow square is retroreflective material used to assist in sighting the buoy at night.

1667: Air masses near the earth's surface __________.

    N a. move from areas of high pressure to areas of low pressure
    N b. are deflected by the earth's rotation in both hemispheres
    N c. are deflected by the "Coriolis effect"
    Y d. All of the above

1675: You are entering port and have been instructed to anchor, as your berth is not yet available. You are on a SW'ly heading, preparing to drop anchor, when you observe the range lights as shown on your starboard beam. You should __________. (D047NG )

    N a. NOT drop the anchor until the lights are in line
    Y b. ensure your ship will NOT block the channel or obstruct the range while at anchor
    N c. drop the anchor immediately as the range lights mark an area free of obstructions
    N d. drop the anchor immediately as a change in the position of the range lights will always be an indication of dragging anchor

1695: Compared to a low pressure system, generally the air in a high is __________.

    N a. warmer, less dense, and less stable
    Y b. cool, more dense, and drier
    N c. muggy and cloudy
    N d. extremely moist with high relative humidity

1723: The intensity of a hurricane as it reaches higher latitudes and cooler waters __________.

    N a. Increases
    N b. remains the same
    Y c. decreases
    N d. None of the above

1739: Which condition indicates that you are in a hurricane's dangerous semicircle in the Northern hemisphere?

    N a. A backing wind
    Y b. A veering wind
    N c. A norther
    N d. A strong, gusty wind

1776: A vessel operating on the Great Lakes, and whose position is southeast of an eastward-moving storm center, would NOT experience __________.

    N a. a falling barometer
    N b. lowering clouds and drizzle
    Y c. a northeast wind
    N d. rain or snow

1920: Because the actual center of some planets may differ from the observed center, the navigator applies a correction known as the __________.

    Y a. phase correction
    N b. refraction correction
    N c. semidiameter correction
    N d. augmentation correction

2059: Illustration D038NG represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter E in the illustration? (D038NG )

    Y a. One red light
    N b. Two red lights
    N c. Two green lights
    N d. Three green lights

2070: What is the relative bearing of an object on the port beam?

    N a. 045
    N b. 090
    N c. 180
    Y d. 270

2112: Vessels regularly navigating rivers above Cairo, Illinois, shall at all times have on board a copy of __________.

    N a. U.S. Coast Pilot
    Y b. U.S. Army Corps of Engineers Regulations (Blue Book)
    N c. Nautical Almanac for the year
    N d. Light List Vol. V

2312: Mars is only seen at two phases, one of which __________.

    Y a. is the full phase
    N b. is conjunction
    N c. occurs only at sunset or sunrise
    N d. occurs at or near 0 elongation

2314: A vessel is heading magnetic east and its magnetic compass indicates a heading of 086. What action should be taken to remove this error during compass adjustment?

    N a. If the blue ends of the magnets are forward you should raise the fore-and-aft tray.
    N b. If the blue ends of the magnets are aft you should lower the fore-and-aft tray.
    Y c. If the blue ends of the magnets are aft, and the fore-and-aft tray is at the top, you should add some magnets.
    N d. If the blue ends of the magnets are aft, and the fore-and-aft tray is at the bottom, you should reverse the magnets.

2376: A large group of stars revolving around a center is known as a __________.

    N a. cluster
    N b. shower
    N c. constellation
    Y d. galaxy

2454: Illustration D037NG represents a moveable dam. If the wickets are down and there are open weirs due to high water, what light(s) will be shown at C if the lock walls and piers are not awash? (D037NG )

    N a. One red light
    Y b. Two red lights
    N c. Three red lights
    N d. One amber light

2582: You must construct a Mercator plotting sheet on a piece of paper measuring 32" by 36". The area includes latitude 31S to 37S and longitude 005W to 002E. Allow a three-quarter inch neat line on all sides. What is the maximum distance between each degree of longitude that will permit the area of the plotting sheet to be drawn within the stated limitations?

    N a. 4.00 inches
    N b. 4.11 inches
    N c. 4.25 inches
    Y d. 4.36 inches

2791: The letter B in illustration D006NG represents the __________.

    N a. sensible horizon
    Y b. geoidal horizon
    N c. celestial horizon
    N d. visible horizon

2826: You take a bearing of 043 and 169 of two objects. What bearing of a third object will give the best fix?

    N a. 356
    Y b. 102
    N c. 144
    N d. 201

2889: On 29 June 1981 you observe a back sight of the upper limb of the Moon. The sextant altitude (hs) is 11416.9'. The height of eye is 36 feet, and the index error is 2.0' off the arc. The horizontal parallax is 60.5'. What is the observed altitude (Ho)?

    N a. 6623.8'
    N b. 6604.4'
    N c. 6600.4'
    Y d. 6553.8'

2950: On an Army Corps of Engineers navigation map, each mile A.H.P. on the Lower Mississippi River is marked by a __________.

    N a. dashed red line
    N b. number showing mileage
    N c. navigation light
    Y d. red circle

2986: Some places maintain a zone time of -13. What are the time and date at Greenwich if the zone time and date are 2152, 10 January?

    N a. 1052, 9 January
    Y b. 0852, 10 January
    N c. 1052, 10 January
    N d. 1052, 11 January

3119: Automatic identification systems (AIS) are required to __________.

    N a. provide safety-related information automatically to shore stations, other vessels and aircraft
    N b. receive safety-related information automatically from similarly equipped vessels
    N c. exchange safety-related information with shore-based facilities
    Y d. All of the above