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.


14: You have replaced the chart paper in the course recorder. What is NOT required to ensure that a correct trace is recorded?


48: When should a navigator rely on the position of floating aids to navigation?


72: The datum from which the predicted heights of tides are reckoned in the tide tables is __________.


158: Discounting slip, if your vessel is turning RPM for 10 knots and making good a speed of 10 knots, the current could be __________.

    N a. with you at 10 knots
    N b. against you at 10 knots
    Y c. slack
    N d. with you at 2 knots

158: Discounting slip, if your vessel is turning RPM for 10 knots and making good a speed of 10 knots, the current could be __________.

    N a. with you at 10 knots
    N b. against you at 10 knots
    Y c. slack
    N d. with you at 2 knots

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

229: The shoreline on charts generally represents the mean __________.

    Y a. high water line
    N b. low water line
    N c. low water spring line
    N d. tide level

267: You are inbound in a channel marked by a range. The range line is 309訊. You are steering 306訊 and have the range in sight as shown. The range continues to open. What action should you take? (D047NG )

    N a. Alter course to the right to 309訊 or more to bring the range in line.
    Y b. Alter course to the left until the range closes, then steer to the left of 306訊.
    N c. Alter course to the left to close the range, then alter course to 309訊.
    N d. Maintain course as it is normal for the range to open as you get close.

272: What does the symbol shown indicate on a chart? (D033NG )

    N a. A sunken vessel marked by a buoy
    Y b. A safe water beacon
    N c. A red and white can buoy
    N d. A can buoy with a rotating white light

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

399: Where will you find information about the duration of slack water?

    N a. American Practical Navigator
    N b. Sailing Directions
    N c. Tide Tables
    Y d. Tidal Current Tables

420: You are inbound in a channel marked by a range. The range line is 309訊. You are steering 306訊 and have the range in sight as shown. The range continues to open. What action should you take? (D047NG )

    Y a. Alter course to the left until the range closes then steer to the left of 306訊.
    N b. Maintain course as it is normal for the range to open as you get close.
    N c. Alter course to the left to close the range, then alter course to 309訊.
    N d. Alter course to the right to 309訊 or more to bring the range in line.

457: Find the height of the tide at Port Wentworth, GA, on 5 October 1983, at 1840 DST (ZD +4).

    N a. 3.0 feet
    N b. 3.5 feet
    N c. 4.0 feet
    Y d. 4.4 feet

537: What will be the height of tide at Gargathy Neck, VA, at 1800 DST (ZD +4), on 16 August 1983?

    N a. 2.3 feet
    Y b. 2.9 feet
    N c. 3.3 feet
    N d. 3.6 feet

565: The letter B as shown represents the __________. (D006NG )

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

842: Coast Pilots and navigational charts are kept corrected and up-to-date by using the __________.

    N a. pilot charts
    Y b. Notices to Mariners
    N c. Tide Tables
    N d. Current Tables

866: Anticyclones are usually characterized by __________.

    Y a. dry, fair weather
    N b. high winds and cloudiness
    N c. gustiness and continuous precipitation
    N d. overcast skies

885: The daily path of a celestial body that is parallel to the celestial equator is the __________.

    N a. altitude circle
    N b. vertical circle
    Y c. diurnal circle
    N d. hour circle

920: What is the average speed of the movement of a hurricane following the recurvature of its track?

    N a. 5 to 10 knots
    Y b. 20 to 30 knots
    N c. 40 to 50 knots
    N d. Over 60 knots

925: Your vessel is at the equator at midnight on 1 January, and a star is observed rising. At what time will this same star rise on 1 February, assuming your vessel's location is still at the equator?

    N a. 2208
    N b. 2110
    Y c. 2158
    N d. 2317

1011: You are underway in the North Sea on course 127訊. You sight a buoy with the topmarks shown bearing two points on the starboard bow. Which action must be taken? (D025NG )

    N a. Alter course to starboard until the buoy is at least two points on the port bow, then hold course.
    N b. Alter course to port until the buoy is broad on the starboard quarter, then hold course.
    N c. Change course to have the buoy close aboard either side.
    Y d. Ensure the bearings change to the right.

1144: Freezing salt water spray should be anticipated when the air temperature drops below what temperature?

    N a. 32蚌 (0.0蚓)
    Y b. 28蚌 (-2.2蚓)
    N c. 0蚌 (-17.8蚓)
    N d. -40蚌 (-28.9蚓)

1199: The Sailing Directions (Enroute) contain information on __________.

    N a. well-charted inner dangers
    N b. port facilities
    Y c. coastal anchorages
    N d. offshore traffic separation schemes

1216: In the Northern Hemisphere, winds veering sharply to the west or northwest with increasing speed are indications that a __________.

    Y a. cold front has passed
    N b. low pressure center is approaching
    N c. stationary front exists
    N d. high pressure center has passed

1325: You change course entering port and steady up on a range with the lights in line. After a few minutes you observe the range lights as shown. You should alter your heading to the __________. (D047NG )

    N a. left, and when the range lights are in line again, resume your original heading
    N b. right, and when the range lights are in line again, steer to keep them dead ahead
    Y c. left, and when the range lights are in line again, steer to keep them in line fine on the starboard bow
    N d. right, and when the range lights are in line again, steer to keep them in line fine on the port bow

1328: 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)?

    Y a. Slack water
    N b. 0.8 kt
    N c. 1.2 kts
    N d. 3.4 kts

1335: Plain language is usually used on marine weather __________.

    Y a. forecasts
    N b. observations
    N c. analyses
    N d. reports

1416: Radiation fog __________.

    N a. always forms over water
    Y b. is formed by a temperature inversion
    N c. is thinnest at the surface
    N d. dissipates during the evening

1459: In a tropical cyclone, in the Northern Hemisphere, a vessel hove to with the wind shifting counterclockwise is __________.

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

1480: What is the definition of height of tide?

    N a. The vertical difference between the heights of low and high water
    N b. The vertical difference between a datum plane and the ocean bottom
    N c. The vertical distance from the surface of the water to the ocean floor
    Y d. The vertical distance from the tidal datum to the level of the water at any time

1484: You should plot your dead reckoning position at __________.

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

1489: Cumulonimbus clouds can produce __________.

    N a. dense fog and high humidity
    Y b. gusty winds, thunder, rain or hail, and lightning
    N c. clear skies with the approach of a cold front
    N d. a rapid drop in barometric pressure followed by darkness

1574: Information about currents around Pacific Coast ports of the U.S. is found in the __________.

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

1586: A green buoy has a yellow triangle on it. This is a(n) __________.

    N a. information or regulatory buoy that has lateral significance
    N b. buoy that is off-station and is marked to warn mariners of its wrong position
    Y c. dual purpose marking used where the ICW and other waterways coincide
    N d. buoy that was set in error and will be replaced with a red nun buoy

1600: Zenith distance is equal to __________.

    Y a. 90 - Ho
    N b. 90 - d
    N c. Ho + d
    N d. 90 - z

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

1665: Air circulation is caused or affected by __________.

    N a. the rotation of the earth on its axis
    N b. convection currents caused by differences in radiant heating between equatorial and polar regions
    N c. mountain ranges
    Y d. All of the above

1673: Information about currents on the Pacific Coast of the U. S. is found in the __________.

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

1722: Hurricanes may move in any direction. However, it is rare and generally of short duration when a hurricane in the Northern Hemisphere moves toward the __________.

    N a. west or northwest
    N b. northeast
    Y c. southeast
    N d. north

1767: Which statement describes the prevailing wind direction in mid-winter in the Gulf Coast area?

    Y a. 30% to 40% of mid-winter winds are from a northern quadrant.
    N b. 40% to 50% of mid-winter winds are from a southern quadrant.
    N c. the winds are variable in speed, but strongest in March.
    N d. None of the above

1902: Under the numbering system used by NGA (NIMA), a four digit number is used for __________.

    N a. large scale charts of infrequently navigated areas such as the polar regions
    N b. charts of rivers or canal systems such as the Ohio River or Erie Canal
    Y c. non-navigational materials, such as a chart correction template or maneuvering board
    N d. foreign charts reproduced by NGA (NIMA)

1976: The Moon is nearest to the Earth at __________.

    Y a. perigee
    N b. the vernal equinox
    N c. the new Moon
    N d. the full Moon

1987: An instrument useful in predicting fog is the __________.

    Y a. sling psychrometer
    N b. microbarograph
    N c. anemometer
    N d. aneroid barometer

1988: The parallel of latitude at 2327'N is the __________.

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

2018: Which magnetic compass corrector(s) can be set while the vessel is on a heading of magnetic east or magnetic west?

    N a. Quadrantal spheres
    N b. Heeling magnet
    Y c. Flinders bar
    N d. Athwartships magnets

2080: You are on course 030訊. The relative bearing of a lighthouse is 45. What is the true bearing?

    N a. 015
    Y b. 075
    N c. 255
    N d. 345

2082: You are holding position above Gallipolis Lock and Dam when you hear two long blasts of the horn from the lock. This indicates that you should __________.

    Y a. enter the riverward lock
    N b. hold position until two more upbound tows have locked through
    N c. enter the landward lock
    N d. hold position until the lower gates are closed

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

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

2177: This diagram represents a movable dam. If there is high water and the wickets are down so that there is an unobstructed navigable pass through the dam, what light(s) will be shown at D if the lock walls and piers are not awash? (D037NG )

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

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

2250: The most important information to be obtained from a barometer is the __________.

    N a. difference between the reading of the two pointers, which shows wind direction
    N b. last two figures of the reading of the pointer, such as .87, .76, or .92
    Y c. present reading of the pressure, combined with the changes in pressure observed in the recent past
    N d. weather indications printed on the dial (such as "cold, wet, etc.") under the pointer

2544: At McAlpine L & D, normal upper pool elevation is 420.0 feet MSL, equal to 12.0 feet on the upper gage. The vertical clearance at the Clark Memorial Highway bridge is 72.6 feet above normal pool. What is the clearance if the gage reads 27.2 feet?

    N a. 25.4 feet
    Y b. 57.4 feet
    N c. 60.6 feet
    N d. 72.6 feet

2750: When pushing a tow and approaching barges tied off to the shore, you should __________.

    N a. increase speed so you will pass faster
    Y b. decrease speed while passing so you won't create a suction
    N c. do nothing different as the barges should be tied off properly
    N d. move to the opposite side of the channel from the barges and increase speed

2762: You take a bearing of 176 of a lighthouse. Which bearing of another object would give the best fix?

    Y a. 079
    N b. 151
    N c. 176
    N d. 292

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

2882: While upbound through Memphis, the weather report on TV news indicates that a warm front is stationary over the Kentucky - Missouri - Tennessee areas. What weather conditions should you expect?

    N a. Strong, gusting winds from the NW with thundershowers
    N b. Light winds from the northeast with clear skies
    N c. A "blue norther"
    Y d. Southerly winds with steady rain; fog or overcast

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'

2939: The buoy indicated by the letter D as shown is a __________. (D044NG )

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

3128: Which of the following statements is TRUE regarding automatic identification systems (AIS)?

    N a. AIS may be used to make passing arrangements via ship-to-ship text messaging thus relieving a vessel operator from sounding whistle signals or making contact via radiotelephone.
    Y b. AIS may be used to make passing arrangements via ship-to-ship text messaging but a vessel operator is still required to sound whistle signals unless the arrangement is made via radiotelephone.
    N c. AIS cannot be used to make passing arrangements because the system does not have the ability to communicate from ship-to-ship in this manner.
    N d. AIS cannot be used to make passing arrangements because the use of the ship-to-ship text messaging feature in this way is prohibited.