USCG Navigation Problems: 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.


74: You are turning for 7.8 mph and estimate the current at 1.0 mph. What is your speed over the ground?


82: If the Rosedale Gage reads -0.5 feet, what is the water level in relation to the low water reference plane? The low water reference plane (LWRP) for Rosedale, MS. is 3.0 feet.


160: How far is it to the Hernando Desoto Bridge in Memphis, TN?


250: At 0045, you obtain the following information:

Radar range to Inlet Point is 1.4 miles;
Radar range to Rocky Point is 2.8 miles.
Radar range to Horton Point is 2.8 miles.

What were the set and drift between 0005 and 0045?

    N a. 275°true, 0.9 knot
    N b. 275°true, 1.4 knots
    Y c. 095°true, 1.4 knot
    N d. 095°True, 0.9 knots

334: Your gyro and electronic gear are again operating. At 1710, Chesapeake Light bears 137°pgc at 6.6 miles. The current is setting 160°T at 2 knots. At your speed of 6 knots, what is your true course to steer to remain in the inbound traffic lane?

    N a. 250°
    N b. 261°
    N c. 265°
    Y d. 269°

344: The maximum ebb current at a location 4.3 miles south of Stratford Point will occur at 0413. The predicted current will be 1.0 knot at 075°. What will be your course made good if you steer 082°T at 8 knots?

    N a. 087°T
    N b. 085°T
    N c. 083°T
    Y d. 081°T

346: At 0415, you take the following bearings:

Stratford Point Light 329.5°pgc
Middle Ground Light 223.5°pgc
Old Field Point Light 199.5°pgc

Which statement is TRUE?

    N a. The current's drift is greater than predicted.
    Y b. You are to the right of your intended track line.
    N c. The course made good since 0352 is 081°T.
    N d. Your fathometer reads about 76 fathoms.

378: A vessel at LAT 37°24.0'N, LONG 178°15.0'W, heads for a destination at LAT 34°18.0'N, LONG 178°25.0°E. Determine the true course and distance by Mercator sailing.

    N a. 041°T, 273.9 miles
    N b. 047°T, 273.9 miles
    Y c. 221°T, 247.2 miles
    N d. 227°T, 247.2 miles

430: At 0820, you change course to 301°psc and reduce speed to 7.5 knots. At 0900, you take the following visual bearings:

Branford Reef Light 023°psc
New Haven Light 293°psc
Tweed Airport Aerobeacon 332°psc

Your 0900 position is __________.

    N a. LAT 41°11.9'N, LONG 72°50.6'W
    Y b. LAT 41°12.1'N, LONG 72°48.6'W
    N c. LAT 41°12.3'N, LONG 72°47.7'W
    N d. LAT 41°12.5'N, LONG 72°44.3'W

560: Which loran line can you follow to remain clear of all danger until south of New London?

    Y a. 9960-Y-43960
    N b. 9960-X-26450
    N c. 9960-W-14900
    N d. 9960-W-15000

662: You are planning a voyage by great circle from LAT 38°00'N, LONG 73°00'W to LAT 49°00'N, LONG 06°00'W. Which of the following statements is TRUE? (Use gnomonic tracking chart WOXZC 5274)

    N a. You will pass to the south of icebergs reported extending to 100 miles south of Cape Race Newfoundland.
    Y b. The shoals with a 25-mile radius around Sable Island will be a hazard.
    N c. You will reach the maximum northerly latitude at longitude 29°45'W.
    N d. The distance is measured in 60-mile segments using the length of a degree of latitude at the vertex.

707: What is the width of the widest span of the Cairo Highway Bridge (Upper Mississippi River mile 1.3)?

    N a. 503 feet
    N b. 625 feet
    Y c. 675 feet
    N d. 800 feet

1690: The locations of locks and dams can be found in the __________.

    N a. Army Corps. of Engineers maps
    Y b. Light List
    N c. Local Notice to Mariners
    N d. Channel Report

1703: At 1218, on 16 March, you are passing the Vicksburg Gage (mile 437.0 AHP). What has been the average current since 0630, 15 March, if you have been making turns for 8.0 mph?

    N a. 0.2 mph
    N b. 0.5 mph
    N c. 0.8 mph
    Y d. 1.2 mph

2153: At 0800 ZT, on 29 June , your DR position is LAT 26°00.0'N, LONG 75°29.5'W. Given a chronometer time of 01h 00m 00s, determine the computed altitude (Hc) of the Sun for the assumed position nearest to the above given latitude and longitude.

    N a. Hc 34°38.6'
    N b. Hc 34°48.6'
    Y c. Hc 34°58.6'
    N d. Hc 35°18.6'

2174: On 18 October , at 0518 ZT, morning stars were observed and the vessel's position was determined to be LAT 25°31.0'N, LONG 146°29.2'E. Your vessel is steaming at 19.0 knots on a course of 308°T. A sextant observation of the Sun's lower limb is made at 0915 ZT. The chronometer reads 11h 17m 11s, and the sextant altitude (hs) is 34°51.4'. The index error is 2.0' off the arc, and the chronometer error is 01m 57s fast. Your height of eye on the bridge is 54.0 feet. What is the azimuth (Zn) of this sight using the assumed position?

    N a. 120.6°T
    N b. 121.9°T
    Y c. 125.5°T
    N d. 127.3°T

2179: On 22 June , at 0906 EDT (ZD +4), your position is LAT 24°36'N, LONG 69°30'W. You are on course 165°pgc at a speed of 14.8 knots. A sextant observation of the Sun's lower limb is made, and the sextant altitude (hs) is 42°44.0' with an index error of 0.8' off the arc. At this time the chronometer reads 01h 10m 12s, and is 2m 42s slow. If your height of eye is 70 feet, what is the azimuth (Zn) of the sight using the assumed position?

    Y a. Zn 080.4°
    N b. Zn 081.6°
    N c. Zn 129.0°
    N d. Zn 130.5°

2297: The Platte River empties into which river?

    N a. Mississippi
    N b. Ohio
    Y c. Missouri
    N d. Tennessee

2652: You are steering 163°T, and a light is picked up dead ahead at a distance of 11 miles at 0142. You change course to pass the light 2 miles off abeam to starboard. If you are making 13 knots, what is your ETA at the position 2 miles off the light?

    N a. 0226
    N b. 0229
    Y c. 0232
    N d. 0235

2655: You are steering 078°T, and a light is picked up dead ahead at a distance of 15.6 miles at 2316. You change course to pass the light 4.5 miles off abeam to port. If you are making 17 knots, what is your ETA at the position 4.5 miles off the light?

    N a. 0006
    Y b. 0009
    N c. 0012
    N d. 0015

2668: Your vessel is on a course of 255°T, at 14 knots. At 2116 a lighthouse is sighted dead ahead at a distance of 11 miles. You change course at this time to pass the lighthouse 3 miles abeam to port. What will be your ETA at this position off the lighthouse?

    N a. 2149
    Y b. 2201
    N c. 2212
    N d. 2228

3064: The propeller of a vessel has a pitch of 19.0 feet. If the vessel traveled 183.5 miles (observed distance) in 24 hours at an average of 44 RPM, what was the slip?

    Y a. +7.4%
    N b. -7.4%
    N c. +11.6%
    N d. -11.6%

3083: The speed necessary to reach port at a designated time is 18.7 knots. The propeller pitch is 24'03", and you estimate 3% positive slip. How many RPM's will the shaft have to turn?

    Y a. 81 RPM
    N b. 87 RPM
    N c. 98 RPM
    N d. 104 RPM

3091: If the pitch of the propeller is 25.1 feet, and the revolutions per day are 91,591, calculate the day's run allowing 7% positive slip.

    Y a. 351.6 miles
    N b. 378.1 miles
    N c. 390.0 miles
    N d. 404.6 miles

3093: If the pitch of the propeller is 23.2 feet, and the revolutions per day are 94,910, calculate the day's run allowing 11% negative slip.

    N a. 322.3 miles
    N b. 362.3 miles
    N c. 382.0 miles
    Y d. 402.0 miles

3314: You have steamed 150 miles and consumed 17 tons of fuel. If you maintain the same speed, how many tons of fuel will you consume while steaming 350 miles?

    N a. 12.82 tons
    N b. 29.41 tons
    N c. 34.00 tons
    Y d. 39.66 tons

3608: You are steering 125°pgc. The wind is southwest by south causing a 3° leeway. The variation is 6°E, the deviation is 2°W, and the gyro error is 1°W. What is the true course made good?

    Y a. 121°T
    N b. 123°T
    N c. 127°T
    N d. 129°T

3608: You are steering 125°pgc. The wind is southwest by south causing a 3° leeway. The variation is 6°E, the deviation is 2°W, and the gyro error is 1°W. What is the true course made good?

    Y a. 121°T
    N b. 123°T
    N c. 127°T
    N d. 129°T

3648: The true course between two points is 312°. Your gyrocompass has an error of 3°W. You make an allowance of 4° leeway for a west by south wind. What gyro course should be steered to make the true course good?

    N a. 305°pgc
    Y b. 311°pgc
    N c. 315°pgc
    N d. 318°pgc

3763: Your vessel is proceeding up a channel, and you see a pair of range lights that are in line dead ahead. The chart indicates that the direction of this pair of lights is 178°T, and the variation is 9°W. If the heading of your vessel at the time of the sighting is 180° per standard magnetic compass, what is the deviation?

    N a. 2°E
    N b. 2°W
    Y c. 7°E
    N d. 7°W

3765: Your vessel is proceeding up a channel steering on a pair of range lights that are in line ahead. The chart indicates that the direction of this pair of lights is 249°T, and the variation is 14°E. If the heading of your vessel at the time of the sighting is 226° per standard magnetic compass, what is the correct deviation?

    N a. 5°E
    N b. 5°W
    Y c. 9°E
    N d. 9°W

6143: At 2027 you obtain a radar range to Shagwong Point of 3.4 miles and a tangent bearing to the east end of Long Island of 172°T. Which statement is TRUE?

    Y a. You are to the left of your DR track.
    N b. You are inside a precautionary area.
    N c. Your speed made good from 1949 to 2027 is 14.0 knots.
    N d. Your course made good from 1949 to 2027 is 111°T.

10503: At 0817 your GPS indicates a position of LAT 37°01.6'N, LONG 75°31.7'W. You are on course 182° per standard magnetic compass at a speed of 9.2 knots. At 0913 your GPS indicates your position at LAT 36°52.3'N, LONG 75°30.8'W. What were the set and drift?

    N a. 121°T at 0.8 knot
    N b. 139°T at 1.1 knots
    Y c. 219°T at 1.1 knots
    N d. 298°T at 0.7 knot

12205: Your vessel is steady on a heading of 160° per standard magnetic compass when you sight Southwest Ledge Light and New Haven Outer Channel Range Rear Light in line dead astern. What is the deviation of the compass based on this observation?

    Y a. 2°E
    N b. 2°W
    N c. 5°E
    N d. 5°W

12709: You are on course 157° per standard magnetic compass when you take the following bearings: Little Gull Island Light 276°psc Race Rock Light 301°psc Latimer Reef Light 028°psc What is your position?

    N a. LAT 41°13.5'N, LONG 71°57.9'W
    Y b. LAT 41°13.5'N, LONG 71°57.4'W
    N c. LAT 41°13.6'N, LONG 71°57.0'W
    N d. LAT 41°13.6'N, LONG 71°57.8'W

12903: Your 1426 position is LAT 37°10.9'N, LONG 75°29.6'W. You are turning for 9.3 knots. What is your ETA at Chesapeake Light?

    N a. 1616
    N b. 1621
    N c. 1626
    Y d. 1633

12904: Your 0916 position is LAT 37°10.9'N, LONG 75°29.6'W. You are turning for 12.3 knots. What is your ETA at North Chesapeake Bay Entrance Buoy NCA?

    N a. 1035
    N b. 1043
    Y c. 1051
    N d. 1101

15120: If you have 17.3 miles to reach your destination from your 2000 position and want to be there at 2230, what speed should you make good?

    N a. 5.7 knots
    N b. 6.1 knots
    N c. 6.5 knots
    Y d. 6.9 knots

15159: From your 1715, fix you steer 214°T at 12 knots. At 1800,
you take the following bearings:

Cape Charles Light bearing 296° true
Cape Henry light bearing 242° true

Your 1800 position is __________.

    N a. LAT 37°02.8'N, LONG 75°43.9'W
    Y b. LAT 37°02.9'N, LONG 75°43.1'W
    N c. LAT 37°03.0'N, LONG 75°43.3'W
    N d. LAT 37°03.1'N, LONG 75°42.8'W

15265: Orient Point Light is __________.

    N a. lighted only during daytime when the sound signal is in operation
    N b. maintained only from May 1 to Oct 1
    N c. 64 feet (19.4 meters) above mean low water
    Y d. lighted throughout 24 hours

15369: Horton Point Light __________.

    Y a. is shown from a white square tower
    N b. has a fixed green light
    N c. is 14 feet above sea level
    N d. is synchronized with a radio beacon

15458: You are delayed in sailing due to engineering problems. You get underway at 0630. A Coast Guard radio broadcast advises that an aircraft carrier will transit the Elizabeth River enroute Norfolk Naval Shipyard and a safety zone is in effect. Further information on how far you must remain from the carrier found is in __________.

    N a. PUB 117
    N b. Light List
    Y c. Coast Pilot
    N d. Chart Number 1

15463: If you are making 10 knots, what is your ETA at York Spit Channel Buoys "19" and "20"?

    N a. 0959
    N b. 1002
    Y c. 1006
    N d. 1011

15509: At 1800, your position is LAT 41°06.5'N, LONG 71°43.5'W. How would the buoy which bears approximately 040°T from your position at a range of half a mile be painted?

    Y a. Horizontally banded, green over red, with a green buoyancy chamber
    N b. Horizontally banded, red over green, with a red buoyancy chamber
    N c. Vertically striped, red and green
    N d. Solid green with red letters "BIS"

15564: What was the current between 0520 and 0600?

    N a. 178° at 0.8 knot
    N b. 178° at 1.2 knot
    N c. 358° at 0.8 knot
    Y d. 358° at 1.2 knots

15567: Point Judith Harbor of Refuge __________.

    N a. is used mostly by towing vessels
    N b. has a maximum depth of 14 feet (4.3 meters) at MHW
    N c. West Gap has a controlling depth of 24 feet
    Y d. is entered through the East Gap or the West Gap

15609: From your 1715 fix, you steer 214°T at 12 knots. At 1800,
you take the following bearings:

Cape Charles Light bearing 296° true
Cape Henry light bearing 242° true

Your 1800 position is __________.

    Y a. LAT 37°02.9'N, LONG 75°43.1'W
    N b. LAT 37°02.9'N, LONG 75°43.9'W
    N c. LAT 37°03.0'N, LONG 75°43.3'W
    N d. LAT 37°03.1'N, LONG 75°42.8'W

15827: As you approach Giles Bend Cutoff Light (mile 367.7 AHP), what type of daymark would you see on the light structure?

    N a. Green diamond
    N b. Green triangle
    Y c. Red triangle
    N d. Red diamond

15870: What is the approximate distance from a point three miles south of Stratford Point to Perth Amboy, NJ?

    N a. 53 miles
    N b. 62 miles
    Y c. 73 miles
    N d. 136 miles

15957: At 1752, your position is LAT 37°04.3'N, LONG 76°06.4'W. On an ebb current you should expect to be set to the __________.

    N a. north northeast
    Y b. south southeast
    N c. south southwest
    N d. north northwest

16117: What is the distance from your 0731 fix to Wilmington, N.C.
(LAT 34°14.0'N, LONG 77°57.0'W)?

    Y a. 339 miles
    N b. 363 miles
    N c. 402 miles
    N d. 486 miles

16440: What course per gyrocompass would you need to steer from the anchorage to York Spit Channel buoy "29"?

    Y a. 172° pgc
    N b. 175° pgc
    N c. 178° pgc
    N d. 181° pgc

16618: What is the distance from your 0200 position to the point where Twenty-Eight Foot Shoal lighted buoy is abeam to starboard?

    N a. 6.6 miles
    Y b. 6.9 miles
    N c. 7.1 miles
    N d. 7.3 miles