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.


201: What is a lighted safe water mark fitted with to aid in its identification?


210: The position labeled C is a(n) __________. (D051NG )


238: 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?


241: A spherical buoy may be __________.

    N a. numbered
    Y b. lettered
    N c. green
    N d. red

369: You are underway on course 050°T and your maximum speed is 11 knots. The eye of a hurricane bears 070°T, 80 miles from your position. The hurricane is moving towards 270°T at 19 knots. What course should you steer at 11 knots to have the maximum CPA?

    N a. 250°
    N b. 234°
    N c. 227°
    Y d. 215 °

415: If the Sun's observed altitude is 54°30', what is the zenith distance?

    Y a. 35°30'
    N b. 45°30'
    N c. 12°30'
    N d. 14°30'

431: When a buoy marks a channel bifurcation, the preferred channel is NOT indicated by __________.

    N a. the shape of an unlighted buoy
    N b. the light color of a lighted buoy
    N c. the color of the topmost band
    Y d. whether the number is odd or even

513: You are radar scanning for a buoy fitted with a racon. Which radar screen represents the presentation you should expect on the PPI? (D017NG )

    N a. A
    Y b. B
    N c. C
    N d. D

556: In a tropical cyclone in the Northern Hemisphere, a vessel hove to with the wind shifting counterclockwise would be __________.

    Y a. in the navigable semicircle
    N b. in the dangerous semicircle
    N c. directly in the path of the center
    N d. ahead of the storm

580: On 21 January 1981, you observe a back sight of the Sun's lower limb. The sextant altitude (hs) is 121°31.5'. The index error is 2.5' on the arc. The height of eye is 31 feet (9.3 meters). What is the observed altitude (Ho)?

    N a. 31°06.2'
    Y b. 58°53.1'
    N c. 58°12.2'
    N d. 58°03.2'

584: The correction(s) which must be applied to an aneroid barometer reading include(s) __________.

    Y a. height error
    N b. gravity error
    N c. temperature error
    N d. All of the above

666: In the Northern Hemisphere, your vessel is believed to be in the direct path of a hurricane, and plenty of sea room is available. The best course of action is to bring the wind on the __________.

    N a. starboard bow, note the course, and head in that direction
    Y b. starboard quarter, note the course, and head in that direction
    N c. port quarter, note the course, and head in that direction
    N d. port bow, note the course, and head in that direction

704: What is TRUE of the history display of a target's past positions on an ARPA?

    N a. It provides a graphic display to emphasize which vessel is on a collision course.
    Y b. In the true presentation, it provides a quick visual check to determine if a vessel has changed course.
    N c. The display is one of the primary inputs and must be in use when using the trial maneuver capability.
    N d. It provides a graphic display of a target vessel's relative course, speed, and CPA.

756: What is a common unit of measure for atmospheric pressure?

    N a. centimeters
    Y b. Inches
    N c. Degrees
    N d. Feet

827: The Benguela Current flows in a __________.

    N a. SW'ly direction along the NW coast of Africa
    N b. S'ly direction off the East Coast of Australia
    Y c. NW'ly direction along the SW coast of Africa
    N d. SW'ly direction along the SE coast of Greenland

874: Altocumulus clouds are defined as __________.

    N a. high clouds
    Y b. middle clouds
    N c. low clouds
    N d. vertical development clouds

879: You are enroute to assist vessel A. Vessel A is underway at 4.5 knots on course 233°T, and bears 346°T at 68 miles from you. What is the course to steer at 13 knots to intercept vessel A?

    Y a. 328°
    N b. 323°
    N c. 318°
    N d. 314°

891: Under the IALA-A Buoyage System, a buoy indicating the preferred channel is to port would have __________.

    N a. an even number
    N b. an odd number
    N c. a pillar shape
    Y d. horizontal bands

905: The Sun's center is coincident with the principal vertical circle when __________.

    Y a. in lower transit
    N b. the hour circle and prime vertical are coincident
    N c. the declination is zero degrees and the azimuth is exactly N 135°E
    N d. the declination is zero degrees and the azimuth is exactly N 135°W

918: At 1200 ZT, on 31 August, your position is LAT 43°14'S, LONG 175°44'E. You are preparing a weather report form, WS Form B-80. How should you encode the first three groups after the call sign if you estimate the wind? (D041NG )

    N a. 01003, 94314, 51757
    Y b. 31003, 99432, 31757
    N c. 31123, 99432, 31754
    N d. 31243, 94314, 31757

933: How many degrees are there on a compass card?

    Y a. 360°
    N b. 380°
    N c. 390°
    N d. 420°

954: A thin, whitish, high cloud popularly known as "mares' tails" is __________.

    N a. altostratus
    N b. stratus
    N c. cumulus
    Y d. cirrus

966: Most high pressure areas in the United States are accompanied by __________.

    N a. precipitation
    Y b. clear, cool weather
    N c. humid, sticky weather
    N d. cool fogs

988: You are preparing a weather report form, WS Form B-80. One-half of the sky is covered with clouds, and the anemometer indicates that the apparent wind is from 340° relative at 14 knots. You are on course 307°T at 12.6 knots. How should you encode group Nddff? (D041NG )

    N a. 53414
    N b. 54013
    Y c. 42205
    N d. 43013

1007: When a current flows in the opposite direction to the waves, the wave __________.

    N a. length is increased
    Y b. height is increased
    N c. velocity increases
    N d. length is unchanged

1078: The description "Racon" beside an illustration on a chart would mean a __________.

    N a. radar conspicuous beacon
    Y b. radar transponder beacon
    N c. radar calibration beacon
    N d. circular radio beacon

1083: Magnets are placed in horizontal trays in the compass binnacle to compensate for the __________.

    N a. induced magnetism in the vessel's horizontal soft iron
    N b. change in the magnetic field when the vessel inclines from vertical
    Y c. permanent magnetism of the vessel
    N d. magnetic fields caused by electrical currents in the vicinity

1093: The Flinders bar on a magnetic compass compensates for the __________.

    Y a. induced magnetism in vertical soft iron
    N b. induced magnetism in horizontal soft iron
    N c. permanent magnetism in ship's steel
    N d. vessel's inclination from the vertical

1121: The articulated light is superior to other types of buoys because __________.

    N a. the radar reflectors reflect better signals
    N b. fog horn signals travel farther to sea
    N c. it is equipped with strobe lights
    Y d. it has a reduced watch circle

1152: When using GPS without Selective Availability, you may expect your horizontal accuracy to be better than __________.

    N a. 3 meters
    Y b. 20 meters
    N c. 100 meters
    N d. 200 meters

1175: Solid green arrows on the main body of a pilot chart indicate __________.

    N a. prevailing wind directions
    Y b. prevailing ocean current directions
    N c. probable surface current flow
    N d. shortest great circle routes

1201: What is NOT true concerning color sectors of lights?

    Y a. Color sectors are expressed in degrees from the light toward the vessel.
    N b. Color sectors may indicate dangerous waters.
    N c. Color sectors may indicate the best water across a shoal.
    N d. Color sectors may indicate a turning point in a channel.

1213: If the magnetic heading is greater than the compass heading, the deviation is __________.

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

1229: The initial great circle course angle between LAT 23°00'S, LONG 42°00'W and LAT 34°00'S, LONG 18°00'E is 063.8°. What is the true course?

    N a. 063.8°T
    Y b. 116.2°T
    N c. 243.8°T
    N d. 296.2°T

1285: You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 248°T at 64 miles from you. What is the time to intercept if you make 13 knots?

    N a. 4h 55m
    N b. 4h 36m
    N c. 3h 59m
    Y d. 3h 44m

1288: 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)?

    N a. 19.2 feet (5.9 meters)
    N b. 20.8 feet (6.3 meters)
    Y c. 24.7 feet (7.5 meters)
    N d. 25.8 feet (7.9 meters).

1302: What feature(s) of a daymark is (are) used to identify the beacon upon which it is mounted?

    Y a. Color and shape
    N b. Size
    N c. Method of construction
    N d. Signal characteristics

1309: When recording the wind direction in the weather log, you would report the __________.

    N a. direction the wind is blowing toward
    Y b. direction the wind is blowing from
    N c. duration of the maximum gust of wind
    N d. wind chill factor

1311: What is the characteristic of a quick light?

    N a. Shows groups of 2 or more flashes at regular intervals
    N b. Durations of light and darkness are equal
    Y c. Shows not less than 60 flashes per minute
    N d. Shows quick flashes for about 5 seconds followed by a 1 second dark period

1348: Vessel required to have an Automatic Radar Plotting Aid must have a device to indicate the __________.

    Y a. speed of the vessel over the ground or through the water
    N b. distance to the next port
    N c. time of the next navigational satellite pass
    N d. None of the above

1460: What is the major advantage of a rhumb line track?

    Y a. The vessel can steam on a constant heading (disregarding wind, current, etc.).
    N b. The rhumb line is the shortest distance between the arrival and departure points.
    N c. It is easily plotted on a gnomonic chart for comparison with a great circle course.
    N d. It approximates a great circle on east-west courses in high latitudes.

1552: Which sextant in illustration D043NG reads 30°42.5'? (D043NG )

    N a. A
    Y b. B
    N c. C
    N d. D

1576: You are entering an east coast port and see a buoy with a yellow triangle painted on it. This indicates __________.

    Y a. you are in the vicinity of the ICW
    N b. the buoy is a special mark
    N c. the buoy is off station
    N d. the buoy designates a sharp turn in the channel

1756: Where would you expect to find climatological and meteorological tables for the Gulf Coast area?

    N a. In the publication entitled Radio Aids to Navigation
    Y b. In the back of Coast Pilot #5
    N c. In any Coast Pilot volume
    N d. Only at the National Weather Service office

1775: The letter A in illustration D006NG represents the __________.

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

1992: The parallel of latitude at 23°27'S is the __________.

    N a. Tropic of Cancer
    Y b. Tropic of Capricorn
    N c. Arctic Circle
    N d. ecliptic

2097: Information about major breakdowns, repairs, or other emergency operations with regard to weirs and (or) wicket dams, on the western rivers, may be obtained by consulting the __________.

    N a. Sailing Directions
    Y b. Broadcast Notice to Mariners
    N c. Light List Vol. V
    N d. None of the above

2209: You have completed the magnetic compass adjustments on magnetic east and magnetic south. The vessel is now steady on magnetic west but the compass reads 266°. You should now adjust the compass until it reads __________.

    Y a. 268°
    N b. 270°
    N c. 274°
    N d. Do not adjust the compass, just record the error.

2256: The constellation that contains Polaris is __________.

    N a. Orion
    N b. Cassiopeia
    Y c. Ursa Minor
    N d. Corona Borealis

2352: When a superior planet is at 90° elongation, it is also at __________.

    N a. conjunction
    N b. opposition
    Y c. quadrature
    N d. transit

2446: What is the equivalent of 47 min. 20 sec. in arc units?

    N a. 8°27'
    Y b. 11°50'
    N c. 13°42'
    N d. 13°56'

2711: Information about currents on the Pacific Coast of the U. S. are found in the __________.

    Y a. Tidal Current Tables
    N b. Nautical Almanac
    N c. Tide Tables
    N d. Ocean Current Tables

2812: A line of position from a celestial observation is a segment of a __________.

    Y a. circle of equal altitude
    N b. parallel of declination
    N c. parallel of altitude
    N d. vertical circle

2859: The buoy indicated by the letter C in illustration D044NG is a __________.

    N a. nun
    N b. can
    N c. spar
    Y d. pillar

2889: On 29 June 1981 you observe a back sight of the upper limb of the Moon. The sextant altitude (hs) is 114°16.9'. 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. 66°23.8'
    N b. 66°04.4'
    N c. 66°00.4'
    Y d. 65°53.8'

2923: You should plot your dead reckoning position __________.

    N a. from every estimated position
    Y b. from every fix or running fix
    N c. every three minutes in pilotage waters
    N d. only in pilotage waters

2927: The position labeled C, as shown, was plotted because __________. (D051NG )

    N a. the vessel's course changed from due North to due East
    Y b. running fixes are better estimates of true position than dead-reckoning positions
    N c. the vessel's speed changed
    N d. All of the above are correct

2973: You should plot a dead reckoning position after every __________.

    N a. course change
    N b. speed change
    N c. fix or running fix
    Y d. All of the above

3077: ECDIS must have the capability to preserve the record of the voyage track for the previous __________.

    N a. 4 hours
    N b. 6 hours
    Y c. 12 hours
    N d. 24 hours

3102: The typical operating range of automatic identification systems (AIS) at sea is nominally __________.

    N a. 50-75 nm
    Y b. 20-25 nm
    N c. 6-8 nm
    N d. 3-4 nm