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.


53: What are the dimensions of Old River Lock, on the Lower Mississippi River?


64: What is the length of the trip?


64: What is the length of the trip?


121: As you approach Casting Yard Dock Lt. (mile 265.4 AHP) you notice on the map a circle with 2 black sectors. This symbol indicates a __________.

    N a. lock
    N b. warning sign
    N c. mooring buoy
    Y d. river gage

149: Your engines are turning for 8.2 mph. You estimate the current at 1.5 mph. What is your speed over the ground?

    Y a. 9.7 mph
    N b. 8.8 mph
    N c. 8.2 mph
    N d. 6.7 mph

179: In order to check your compasses, you sight North Dumpling Island Light in line with Latimer Reef Light bearing 077°pgc. The helmsman was steering 307°pgc and 320° per standard magnetic compass at the time. Which statement is TRUE?

    N a. The gyro error by observation is 2°E.
    N b. The deviation based on the observation is 15°W.
    Y c. The magnetic compass error is 14°W.
    N d. The true line of the range is 079°.

308: A vessel at LAT 20°00'N, LONG 107°30'W is to proceed to LAT 24°40'N, LONG 112°30 W. What is the course and distance by mid-latitude sailing?

    N a. 314.0°T, 389.0 miles
    Y b. 315.3°T, 394.0 miles
    N c. 317.2°T, 397.0 miles
    N d. 318.3°T, 399.0 miles

387: The wind is southerly, and you estimate 3° leeway. Allowing for leeway, what is the course to steer from your 0745 position to pass 1 mile south of Watch Hill Buoy "WH"?

    Y a. 087°pgc
    N b. 085°pgc
    N c. 081°pgc
    N d. 079°pgc

544: From your 0600 position, what is the course per gyrocompass to leave Watch Hill Light abeam to starboard at 2.0 miles if a southerly wind is producing 3° of leeway?

    N a. 262°pgc
    N b. 258°pgc
    N c. 256°pgc
    Y d. 252°pgc

744: On 22 May , at 0440 ZT, your vessel's DR position is LAT 23°24'N, LONG 110°24'W. At approximately this time, you obtain a sextant altitude (hs) of Polaris reading 23°40.9' with an index error of 1.6' on the arc. Your chronometer reads 11h 42m 14s, and is 2m 36s fast. What is your latitude by Polaris, given a height of eye of 24 feet?

    N a. 23°28.6'N
    N b. 23°30.0'N
    Y c. 23°31.2'N
    N d. 23°32.8'N

1175: On 12 February , your 0900 zone time DR position is LAT 16°43.0'N, LONG 51°42.0'W. Your vessel is on course 093°T at a speed of 18.5 knots. What is the zone time of local apparent noon (LAN)?

    Y a. 1237
    N b. 1233
    N c. 1230
    N d. 1226

1204: On 25 April , your 0930 zone time position is LAT 28°35'S, LONG 82°30'W. Your vessel is on course 300°T at a speed of 20.0 knots. Determine the time of LAN.

    Y a. 1131
    N b. 1158
    N c. 1211
    N d. 1225

1242: The solid lines extending into the channel at mile 948 AHP are __________.

    Y a. dikes
    N b. revetments
    N c. spoil areas
    N d. Westvaco Service Facilities

1279: At 0327 ZT, on 29 May , your DR position is LAT 25°00'N, LONG 64°15'W. You are steering 270°T at a speed of 13.6 knots. What is the zone time of sunrise?

    N a. 0521
    Y b. 0529
    N c. 0536
    N d. 0548

1343: At 1019, on 10 March, you pass under the Greenville Bridge (mile 531.3 AHP). What was your average speed since departing River Cement Co. Dock?

    Y a. 7.2 mph
    N b. 6.8 mph
    N c. 6.5 mph
    N d. 6.2 mph

1706: The highest point on your towboat is 53 feet above the water, and the Helena Gage (mile 663 AHP) reads 3.9 feet. What is the vertical clearance when you pass under the B-span of the Helena Highway Bridge in Helena?

    N a. 59.9 feet
    Y b. 62.5 feet
    N c. 64.1 feet
    N d. 65.5 feet

1722: You estimate the current as 2.0 mph. What is the speed over the ground?

    N a. 4.5 mph
    Y b. 5.5 mph
    N c. 7.5 mph
    N d. 9.5 mph

1854: On 22 July , your 1759 ZT DR position is LAT 24°50.2'S, LONG 05°16.0'E. You observe an unidentified star bearing 231°T, at an observed altitude (Ho) of 26°10.0'. The chronometer reads 06h 01m 31s and is 02m 15s fast. What star did you observe?

    N a. Acamar
    N b. Capella
    N c. Miaplacidus
    Y d. Suhail

1907: On 22 March , your 1834 DR position is LAT 26°13.5'S, LONG 108°36.5'W. You observe an unidentified star bearing 062°T at an observed altitude (Ho) of 23°22.0'. The chronometer reads 01h 32m 37s, and is 01m 50s slow. Which star did you observe?

    Y a. Regulus
    N b. Menkar
    N c. Rigel
    N d. Alphard

2341: You have steamed 1175 miles at 19 knots, and consumed 257 tons of fuel. If you have to steam 1341 miles to complete the voyage, how many tons of fuel will be consumed while steaming at 18 knots?

    N a. 293 tons
    Y b. 263 tons
    N c. 202 tons
    N d. 172 tons

2683: You are underway on a course of 135°pgc at 15 knots, and you sight a lighthouse dead ahead at a range of 12.5 miles at 1145. What course would you steer to leave the lighthouse 3.0 miles off your port beam?

    N a. 117°pgc
    N b. 121°pgc
    Y c. 149°pgc
    N d. 154°pgc

2704: You are underway on course 340°T at a speed of 14.8 knots.
You sight a buoy bearing 342°T at a radar range of 4.8 miles at 1422. If you change course at 1428, what is the true course to steer to leave the buoy abeam to port at 1.0 mile?

    N a. 327°T
    N b. 354°T
    N c. 357°T
    Y d. 001°T

2777: The Helena Gage reads 2.3 feet. The high point on your towboat is 26 feet above water. What is the vertical clearance when you pass under the Helena Highway Bridge?

    N a. 76.0 feet
    N b. 84.2 feet
    N c. 89.5 feet
    Y d. 90.7 feet

2865: You are steering a course of 240°T, and a lighthouse bears 025° on the starboard bow at 2116. At 2144 the same lighthouse bears 050° on the starboard bow, and you have run 6 miles since the first bearing. What is the ETA when the lighthouse is abeam?

    N a. 2156
    N b. 2159
    Y c. 2202
    N d. 2205

2911: What is indicated by the two light gray shaded areas that cross the river above False River Lt. (mile 251.0 AHP)?

    N a. Ferry crossings
    Y b. Utility crossings
    N c. Aerial cable crossings
    N d. Bridge construction

3074: If the speed necessary for reaching port at a designated time is 19.2 knots and the pitch of the propeller is 22.7 feet, how many revolutions per minute will the shaft have to turn, assuming a 4% positive slip?

    N a. 82
    Y b. 89
    N c. 96
    N d. 103

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

3285: While steaming at 19.4 knots, your vessel consumes 392 barrels of fuel oil per day. In order to reduce consumption to 182 barrels of fuel oil per day, what is the maximum speed the vessel can turn for?

    N a. 13.2 knots
    Y b. 15.0 knots
    N c. 17.4 knots
    N d. 18.2 knots

10307: You are 3 miles due east of Montauk Point Light. What is the course per standard magnetic compass to a position 0.5 mile due south of Race Rock Light?

    Y a. 324°psc
    N b. 328°psc
    N c. 331°psc
    N d. 339°psc

10703: At 1516 your position is LAT 41°11.3'N, LONG 71°48.6'W. You are on course 300° per standard magnetic compass at 9.4 knots. At 1600 your position is LAT 41°14.0'N, LONG 71°58.1'W. What were the set and drift?

    N a. 142°T at 1.9 knots
    N b. 153°T at 1.4 knots
    Y c. 332°T at 1.5 knots
    N d. 347°T at 1.1 knots

10902: Fishermans Island (LAT 37°05.0'N, LONG 75°57.7'W) is __________.

    N a. privately owned
    N b. sparsely wooded and awash at spring tides
    N c. a high rocky promontory with marshy backwater
    Y d. a National Wildlife Refuge

11100: Block Island is __________.

    N a. surrounded by wide sandy beaches
    N b. a low, marshy island
    Y c. hilly with elevations to 200 feet (60.5 m)
    N d. a national bird sanctuary

11304: At 1422 your GPS position is LAT 37°07.5'N, LONG 75°39.1'W. At 1549 your position is LAT 36°57.0'N, LONG 75°41.0'W. What was the course made good between the fixes?

    N a. 185°T
    Y b. 188°T
    N c. 194°T
    N d. 198°T

12702: You are on course 282° per standard magnetic compass when you take the following bearings: Point Judith Light - 073°psc Block Island North Light - 156°psc Watch Hill Point Light - 293°psc What is your position?

    Y a. LAT 41°17.0'N, LONG 71°38.2'W
    N b. LAT 41°17.1'N, LONG 71°39.1'W
    N c. LAT 41°17.2'N, LONG 71°38.7'W
    N d. LAT 41°17.2'N, LONG 71°37.8'W

15140: At 2100 your position is 40°44.1'N, 72°07.6'W. From this position, at which time will Montauk Point Light become visible if the luminous range of the light is 8 miles?

    N a. 2215
    Y b. 2221
    N c. 2227
    N d. 2235

15165: At 2000, your position is LAT 37°04.1'N, LONG 76°05.6'W. You change course for the Eastern Shore. At 2037, Old Plantation Flats Light bears 033°pgc, and York Spit Light bears 282°pgc. The course made good from your 2000 position was __________.

    Y a. 006°T
    N b. 014°T
    N c. 020°T
    N d. 028°T

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

15446: You are abeam of buoy "18" at 2325. What is your ETA at Baltimore if you average 9.5 knots?

    N a. 1342
    Y b. 1400
    N c. 1424
    N d. 1456

15466: At 1015, you estimate you have 139 miles to complete the voyage. If you average 9.5 knots, you will complete the voyage in __________.

    N a. 14 hours 22 minutes
    N b. 14 hours 30 minutes
    Y c. 14 hours 38 minutes
    N d. 14 hours 44 minutes

15708: Which structure should you look for while trying to locate Southwest Ledge Light?

    N a. White conical tower with a brown band midway of height
    Y b. White octagonal house on a cylindrical pier
    N c. Conical tower, upper half white, lower half brown
    N d. Black skeleton tower on a granite dwelling

15710: From your 0830 position, you wish to make good 097°T. There is no current, but a southerly wind is producing 3°
leeway. What course should you steer per standard magnetic compass in order to make good your true course?

    N a. 118°psc
    Y b. 115°psc
    N c. 112°psc
    N d. 109°psc

15862: At 0125, you change course to make good 280°T. What is the course per standard magnetic compass?

    N a. 290°psc
    Y b. 292°psc
    N c. 294°psc
    N d. 296°psc

15966: The yellow buoys on either side of your vessel that lead to Mobjack Bay mark __________.

    N a. the limits of the dredged channel
    Y b. fish trap areas
    N c. underwater cable areas
    N d. ferry routes

16042: At 1022 when you complete the evacuation, you get underway on course 098°T and order turns for 14.5 knots. You take the following round of bearings at that time:
Stratford Point Light - 260° per gyrocompass
New Haven Light - 326° per gyrocompass
SW Ledge Light - 358° per gyrocompass

Determine your ETA and distance off when abeam of Falkner Island Light, if there are no set and drift?

    N a. 1102, 3.0 miles
    Y b. 1108, 3.3 miles
    N c. 1114, 3.1 miles
    N d. 1118, 3.3 miles

16067: At 2118, you obtain the following information:
Cape Henry Light 151°pgc;
Cape Charles Light 033°pgc;
Thimble Shoal Light 291°pgc

What is your 2118 position?

    Y a. LAT 36°57.4'N, LONG 76°01.9'W
    N b. LAT 36°57.5'N, LONG 76°01.4'W
    N c. LAT 36°57.6'N, LONG 76°01.8'W
    N d. LAT 36°57.6'N, LONG 76°02.2'W

16311: The broken magenta line which runs parallel to the shore between Roanoke Point and Mattituck Inlet marks a __________.

    N a. pipeline
    Y b. fish trap area
    N c. demarcation line
    N d. cable area

16420: If you want to put into Point Judith Harbor of Refuge, what chart should you use?

    N a. 13205
    N b. 13209
    N c. 13217
    Y d. 13219

16462: Which statement about your 0400 position is TRUE?

    Y a. You are within the territorial sea and contiguous zone.
    N b. You are governed by the Inland Rules of the Road.
    N c. The ocean floor is composed of shale.
    N d. Anchoring, trawling and fishing are prohibited.

16560: From your 1800 position, you steer a course of 355°psc at a speed of 10.0 knots. At 1830, your position is LAT 41°11.7'N, LONG 71°45.8'W. What are the set and drift of the current?

    Y a. 005°T, 1.0 knot
    N b. 005°T, 0.5 knots
    N c. 180°T, 0.5 knot
    N d. 208°T, 1.0 knots

16565: You decide to use the 9960-Y and 9960-W rates. At 1915,
you obtain the following readings:

9960-Y-43937.5
9960-W-14651.2

What is your 1915 position?

    N a. LAT 41°13.6'N, LONG 71°54.0'W
    Y b. LAT 41°13.5'N, LONG 71°53.4'W
    N c. LAT 41°13.4'N, LONG 71°53.1'W
    N d. LAT 41°14.4'N, LONG 71°53.7'W