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.


29: You are approaching a multiple-span bridge at night. The main navigational channel span will be indicated by __________.


51: In the U.S. Aids to Navigation System, red and green horizontally-banded buoys mark __________.


67: What is the definition of height of tide?


80: When the moon is at first quarter or third quarter phase, what type of tides will occur?

    N a. Apogean
    N b. Perigean
    Y c. Neap
    N d. Spring

123: If the radio signal ground wave extends out for less distance than the minimum skywave distance, there is an area in which no signal is received. This is called the __________.

    Y a. skip zone
    N b. blackout zone
    N c. diffraction zone
    N d. shadow zone

159: The apparent wind can be zero when the true wind is from __________.

    N a. ahead and equal to the ship's speed
    Y b. astern and equal to the ship's speed
    N c. ahead and equal to twice the ship's speed
    N d. astern and equal to twice the ship's speed

207: An important lunar cycle affecting the tidal cycle is called the nodal period. How long is this cycle?

    N a. 16 days
    N b. 18 days
    N c. 6 years
    Y d. 19 years

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

    N a. fix
    Y b. running fix
    N c. estimated position
    N d. dead reckoning position

269: The wind at Frying Pan shoals has been south-southwesterly at an average velocity of 30 knots. The predicted set and drift of the rotary current are 232 at 0.8 knot. What current should you expect?

    N a. 065 at 1.2 knots
    N b. 092 at 1.3 knots
    N c. 139 at 0.6 knot
    Y d. 224 at 0.4 knot

286: On the pole side of the trade wind belt, there is an area of high pressure with weak pressure gradients and light, variable winds. This area is called the __________.

    N a. prevailing westerlies
    N b. geostrophic winds
    N c. doldrums
    Y d. horse latitudes

297: The tides in Boston Harbor generally __________.

    N a. are diurnal in nature
    N b. have their variations caused by the changing declination of the Moon
    Y c. have a greater range than the tides in Gulf Coast ports
    N d. All of the above

340: Information about the direction and velocity of rotary tidal currents is found in the __________.

    N a. Mariner's Guide
    N b. Nautical Almanac
    N c. Tide Tables
    Y d. Tidal Current Tables

348: When using a radar in an unstabilized mode, fixes are determined most easily from __________.

    N a. center bearings
    N b. tangent bearings
    N c. objects that are close aboard
    Y d. ranges

476: Tropical cyclones normally form within which of the following belts of latitude?

    Y a. 5 to 15
    N b. 15 to 30
    N c. 30 to 45
    N d. 45 to 60

594: Barometers are calibrated at a standard temperature of __________.

    N a. 0F
    Y b. 32F
    N c. 60F
    N d. 70F

655: The equator is __________.

    Y a. the primary great circle of the Earth perpendicular to the axis
    N b. the line to which all celestial observations are reduced
    N c. the line from which a celestial body's altitude is measured
    N d. All of the above

660: What is the length of a nautical mile?

    N a. 1,850 meters
    N b. 5,280 feet
    N c. 1,760 yards
    Y d. 6,076 feet

727: What is an ebb current?

    N a. A current at minimum flow
    N b. A current coming in
    Y c. A current going out
    N d. A current at maximum flow

729: The doldrums are characterized by __________.

    N a. steady, light to moderate winds
    Y b. frequent calms
    N c. clear skies
    N d. low humidity

735: The period of the Earth's revolution from perihelion to perihelion is the __________.

    N a. astronomical year
    Y b. anomalistic year
    N c. solar year
    N d. sidereal year

735: The period of the Earth's revolution from perihelion to perihelion is the __________.

    N a. astronomical year
    Y b. anomalistic year
    N c. solar year
    N d. sidereal year

744: A hand held instrument used to measure distances between objects and the ship is a __________.

    N a. vernier
    N b. psychrometer
    N c. hygrometer
    Y d. stadimeter

762: Chart correction information is NOT disseminated through the __________.

    N a. Summary of Corrections
    N b. Local Notice to Mariners
    N c. Daily Memorandum
    Y d. Chart Correction Card

825: While steering a course of 150T, you wish to observe the Sun for a speed check. What would the azimuth have to be?

    N a. 000T
    N b. 090T
    Y c. 150T
    N d. 240T

849: The Light List shows that a navigational light has a nominal range of 12 miles and a height above water of 25 feet (7.6 meters). Your height of eye is 30 feet (9.1 meters) and the visibility is 0.5 mile. At what approximate range will you first sight the light?

    N a. 0.5 mile
    Y b. 1.4 miles
    N c. 5.2 miles
    N d. 12.0 miles

964: The thin, whitish, high clouds composed of ice crystals, popularly known as "mares' tails" are __________.

    Y a. cirrus
    N b. cirrocumulus
    N c. altostratus
    N d. nimbostratus

970: You are preparing a weather report form, WS Form B-80. The sky is overcast, and the anemometer indicates that the apparent wind is from 144 relative at 8 knots. You are on course 162T at 15 knots. How should you encode group Nddff? (D041NG )

    N a. 91521
    Y b. 83322
    N c. 81408
    N d. 01615

1000: You are inbound in a channel marked by a range. The range line is 309T. You are steering 306T. The range appears as shown and is closing. Which action should you take? (D047NG )

    Y a. Continue on course until the range is closed, then alter course to the right.
    N b. Continue on the present heading until the range is in line, then alter course to the left.
    N c. Immediately alter course to the right to bring the range in line.
    N d. Immediately alter course to 309T to bring the range in line.

1015: Which statement about the time diagram shown is correct? (D005NG )

    N a. The Greenwich hour angle of the Sun is greater than 180.
    N b. The meridian angle of the Sun is labeled west.
    N c. The date of Greenwich is the day after the date for observer at M.
    Y d. The Sun has already passed the lower branch of the observer's meridian.

1075: The expression "first magnitude" is usually used to refer only to bodies of magnitude __________.

    Y a. 1.5 and greater
    N b. 1.25 and greater
    N c. 1.0 and greater
    N d. 0.5 and greater

1099: You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133T, and bears 343T at 92 miles from you. What is the course to steer at 9 knots to intercept vessel A?

    N a. 356
    Y b. 003
    N c. 022
    N d. 038

1131: On navigational aids, what does the light characteristic "Fl(2+1)" mean?

    N a. A flashing light combined with a fixed light of greater brightness
    Y b. Light flashes combined in groups, with a different number of flashes in each group
    N c. A light showing groups of two or more flashes at regular intervals
    N d. A fixed light varied at regular intervals by groups of two or more flashes of greater brightness

1231: Some lights used as aids to marine navigation have a red sector to indicate a danger area. How are the limits of a colored sector of light listed in the Light List?

    N a. Geographical positions outlining the area of the sector
    N b. True bearings as observed from the light toward a vessel
    Y c. True bearings as observed from a vessel toward the light
    N d. Bearings given in the Light List are always magnetic

1259: General information on enroute weather and climate is found in __________.

    Y a. the Sailing Directions and the Coast Pilot
    N b. a weather fax
    N c. the Local Notice to Mariners
    N d. the Light List

1462: Altocumulus clouds are indicated by which number? (D039NG )

    N a. 1
    N b. 3
    N c. 4
    Y d. 5

1521: To avoid error you should read the scale of an aneroid barometer with your eye placed __________.

    N a. to the right of the pointer
    N b. to the left of the pointer
    Y c. directly in front of the pointer
    N d. slightly above the meniscus

1556: The vertical distance from the tidal datum to the level of the water is the __________.

    N a. range of tide
    N b. charted depth
    Y c. height of tide
    N d. actual water depth

1557: A Doppler log in the volume reverberation mode indicates __________.

    N a. speed being made good
    Y b. speed through the water
    N c. the set of the current
    N d. the depth of the water

1599: The time interval between successive wave crests is called the __________.

    N a. trough
    Y b. period
    N c. frequency
    N d. epoch

1636: A type of precipitation that occurs only in thunderstorms with strong convection currents that convey raindrops above and below the freezing level is known as __________.

    N a. sleet
    Y b. hail
    N c. freezing rain
    N d. rime

1640: Clouds with the prefix "nimbo" in their name __________.

    N a. are sheet or layer clouds
    N b. have undergone great vertical development
    N c. are middle or high altitude clouds
    Y d. are rain clouds

2085: Information about major breakdowns, repairs, or other emergency operations with regard to weirs and (or) wicket dams, on the western rivers, may be obtained from the __________.

    Y a. Broadcast Notice to Mariners
    N b. Light List Vol. V
    N c. U.S. Coast Pilot
    N d. Sailing Directions

2163: The letter C in illustration D006NG represents the __________.

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

2212: Which information is found in the chart title?

    N a. Number of the chart
    N b. Edition date
    N c. Variation information
    Y d. Survey information

2234: A vessel is heading magnetic north and its magnetic compass indicates a heading of 003. What action should be taken to remove this error during compass adjustment?

    N a. Move the quadrantal spheres closer to the compass
    N b. Raise the heeling magnet if the red end is up
    N c. Remove some of the Flinders bar
    Y d. Raise or lower the athwartship magnets

2301: The letter C in illustration D006NG represents the __________.

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

2372: In the North Sea area, you sight a buoy showing a quick white light showing 6 flashes followed by one long flash at 15 second intervals. Which of the four topmarks illustrated in diagram D031NG would be fitted to this buoy? (D031NG )

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

2618: You must draw a plotting sheet covering latitudes 38N to 43N and longitudes 179E to 178W. If the distance between each degree of longitude is 5 inches, what is the distance between latitude 38N and latitude 43N?

    N a. 29.0 inches
    N b. 29.6 inches
    N c. 32.1 inches
    Y d. 32.8 inches

2668: You are approaching a drawbridge and have sounded the request-for-opening signal. The bridge has responded with five short blasts. What reply should you sound?

    N a. None; No reply is required
    Y b. Five short blasts
    N c. Two prolonged blasts
    N d. One prolonged, one short blast

2690: Right ascension is primarily used by the navigator for __________.

    N a. calculating amplitudes
    N b. calculating great circle sailings by the Ageton method
    N c. entering the Air Navigation Tables (Selected Stars) Pub 249
    Y d. plotting on star finders

2712: A bold reef is a reef __________.

    N a. with part of it extending above the water
    Y b. that can be detected by water turbulence
    N c. that drops off sharply
    N d. perpendicular to the current

2780: You are pushing a tow ahead and passing close to another towboat which is pushing ahead in the same direction (you are overtaking). After the towheads pass close alongside __________.

    N a. you will gain speed
    N b. both boats will gain speed
    N c. the tows will tend to drift apart
    Y d. the tows will tend to drift together

2780: You are pushing a tow ahead and passing close to another towboat which is pushing ahead in the same direction (you are overtaking). After the towheads pass close alongside __________.

    N a. you will gain speed
    N b. both boats will gain speed
    N c. the tows will tend to drift apart
    Y d. the tows will tend to drift together

2928: You are in a buoyed channel at night and pass a lighted buoy with an irregular characteristic. You should report this to the __________.

    Y a. Coast Guard
    N b. harbor master
    N c. Corps of Engineers
    N d. National Ocean Service

2944: The height of a wave is the vertical distance __________.

    N a. from the still water plane to the crest
    N b. from the still water plane to the trough
    Y c. from crest to trough
    N d. between water levels at one-quarter of the wave's length

3057: IN REGION A of the IALA Buoyage System, when entering from seaward, the starboard side of a channel would be marked by a __________.

    Y a. green conical buoy
    N b. green can buoy
    N c. red can buoy
    N d. red conical buoy

3081: The highest level of commercial navigational accuracy is provided by __________.

    Y a. DGPS, within a coverage area
    N b. SPS, without selective availability
    N c. PPS, without selective availability
    N d. NAVSAT, using the Doppler-shift

3112: With respect to automatic identification systems (AIS) which of the following information is broadcast every one to ten seconds?

    N a. Vessel's draft
    N b. Air Draft
    Y c. Navigational status
    N d. Dimensions of vessel

3113: With respect to automatic identification systems (AIS), which information is required to be broadcast every 1 to 10 seconds?

    N a. Call sign
    N b. Vessel's draft
    N c. Route plan
    Y d. None of the above

3115: With respect to automatic identification systems (AIS), which information is required to be broadcast every 1 to 10 seconds?

    Y a. Time stamp
    N b. Destination
    N c. Location of antenna
    N d. None of the above