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.

193: If the visibility is 3 miles, at what range will you lose sight of Chesapeake Light?
253: According to the DR track line from your 0100 position, how far off Roanoke Point Shoal Buoy "5" should you be when the buoy is abeam?
293: At 1730, your position is LAT 37°13.9'N, LONG 76°26.4'W. You are steering course 088° per standard magnetic compass (psc) at an engine speed of 8.0 knots. What is your distance off Tue Marshes Light at 1730?
459: Determine the great circle distance and initial course from LAT 25°47.0'N, LONG 79°59.5'W to LAT 38°42.0'N, LONG 09°10.5'W. 

    N a. 3341.0 miles, 063°T
    N b. 3347.0 miles, 063°T
    N c. 3427.8 miles, 061°T
    Y d. 3588.6 miles, 059°T
478: The great circle distance from LAT 38°17'N, LONG 123°16'W to LAT 35°01'N, LONG 142°21'E is 4330 miles, and the initial course is 300.9°T. Determine the latitude of the vertex. 

    N a. 46°54.8'N
    N b. 47°24.7'N
    N c. 47°35.2'N
    Y d. 47°40.5'N
483: The great circle distance from LAT 25°50'N, LONG 77°00'W to LAT 35°56'N, LONG 06°15'W is 3616 miles, and the initial course is 061.7°T. The position of the vertex is LAT 37°34.9'N, LONG 25°59.0'W. The difference of longitude from the vertex to a point (X) on the great circle track is 10°W. Determine the latitude which intersects the great circle at point (X). 

    N a. 37°02.5'N
    Y b. 37°09.5'N
    N c. 37°15.6'N
    N d. 37°21.2'N
563: At 0705, the gyro loses power. At 0715, you are on course 092° per standard magnetic compass (psc) when you take the following bearings: Falkner Light bears 356°psc, Horton Point Light bears 123°psc, and Kelsey Point Breakwater Light bears 048°psc. What is the position of your 0715 fix? 

    N a. LAT 41°06.7'N, LONG 72°36.0'W
    Y b. LAT 41°07.0'N, LONG 72°36.2'W
    N c. LAT 41°07.2'N, LONG 72°36.4'W
    N d. LAT 41°07.4'N, LONG 72°36.4'W
573: Visibility has decreased to 1 mile in haze. At 0948, you take the following radar ranges. What course should you steer from this fix to the York Spit channel between buoys "19" and "20"?

Thimble Shoal Light - 5.9 miles South end of trestle C of the Chesapeake Bay Bridge and Tunnel - 3.8 miles South end of trestle B of the Chesapeake Bay Bridge and Tunnel - 5.4 miles 

    Y a. 010°pgc
    N b. 008°pgc
    N c. 004°pgc
    N d. 001°pgc
608: At 1200 zone time, on 10 October , you depart San Francisco, LAT 37°48.5'N, LONG 122°24.0'W (ZD +8). You are bound for Yokohama, LAT 35°27.0'N, LONG 139°39.0'E, and you estimate your speed of advance at 22 knots. The distance is 4,536 miles. What is your estimated zone time of arrival at Yokohama? 

    N a. 0111, 19 October
    N b. 0211, 19 October
    N c. 1011, 19 October
    Y d. 1911, 19 October
739: On 29 April , your 1913 zone time DR position is LAT 22°09.0'N, LONG 56°16.0'W. At that time you observe Polaris with a sextant altitude (hs) of 22°25.8'. The chronometer time of the sight is 11h 11m 14s, and the chronometer error is 02m 18s slow. The index error is 1.5' off the arc, and the height of eye is 61.5 feet. What is your latitude by Polaris? 

    N a. 21°39.9'N
    N b. 21°55.7'N
    Y c. 22°39.9'N
    N d. 22°48.8'N
819: On 27 March , in DR position LAT 32°31.0'N, LONG 76°25.0'W, you take an ex-meridian observation of the Sun's lower limb. The chronometer time of the sight is 05h 23m 32s, and the chronometer error is 01m 30s fast. The sextant altitude (hs) is 59°59.0'. The index error is 1.8' off the arc, and your height of eye is 52 feet. What is the latitude at meridian transit? 

    N a. LAT 32°21.6'N
    Y b. LAT 32°29.5'N
    N c. LAT 32°37.6'N
    N d. LAT 32°46.2'N
1136: The Arkansas City Yellow Bend revetment on the LMR extends from mile __________. 

    Y a. 555.0-549.7 RDB
    N b. 549.0-548.5 RDB
    N c. 556.9-554.9 LDB
    N d. 548.5-546.5 LDB
1176: On 24 January , your 0700 zone time DR position is LAT 22°25.0'N, LONG 46°10.0'W. Your vessel is on course 110°T at a speed of 12.0 knots. What is the zone time of local apparent noon (LAN)? 

    N a. 1203
    N b. 1208
    Y c. 1212
    N d. 1215
1190: On 12 February , your 0930 zone time DR position is LAT 25°20.0'N, LONG 30°40.0'W. Your vessel is on course 135°
T at a speed of 11.2 knots. What is the zone time of local apparent noon (LAN)? 

    N a. 1210
    Y b. 1215
    N c. 1220
    N d. 1224
1261: On 16 February , your 0300 ZT DR position is LAT 28°32.0'S, LONG 176°49.0'E. You are on course 082°T at a speed of 21 knots. What will be the zone time of sunrise at your vessel? 

    N a. 0534
    Y b. 0552
    N c. 0631
    N d. 0645
1417: What is the distance from Baton Rouge, LA, to Hickman, KY, on the Mississippi River System? 

    N a. 117 miles
    N b. 433 miles
    N c. 656 miles
    Y d. 692 miles
1671: On 9 May , your vessel's 1809 ZT DR position is LAT 48°13.7'N, LONG 168°36.3'E, when an amplitude of the Sun is observed. The Sun's center is on the celestial horizon and bears 283.7° per standard magnetic compass. Variation in the area is 13.0°E. The chronometer reads 07h 13m 19s and is 02m 56s fast. What is the deviation of the standard compass? 

    Y a. 0.1°W
    N b. 1.1°W
    N c. 1.1°E
    N d. 1.9°W
1809: Which daymark would you see at Shields Bar Lt. (mile 882.2 AHP)? 

    N a. Red triangle
    N b. Green triangle
    Y c. Red diamond
    N d. Green square
1898: On 22 May , your 0437 DR position is LAT 25°18.5'N, LONG 51°18.0'W. You observe an unidentified star bearing 142°T at an observed altitude (Ho) of 23°10.2'. The chronometer reads 07h 40m 40s, and is 03m 24s fast. What star did you observe? 

    N a. Markab
    N b. Diphda
    N c. Sabik
    Y d. Fomalhaut
2062: You are downbound, passing by Spanish Moss Lt. (mile 534.2 AHP), when you observe on your Mississippi River map several black broken lines extending into the river from the bank. These indicate __________. 

    N a. fleeting areas
    N b. revetments
    N c. dikes
    Y d. weirs
2167: On 4 July , at 0630 ZT, morning stars were observed, and the vessel's position was determined to be LAT 21°15.0'S, LONG 21°20.0'W. Your vessel is steaming at 13.0 knots on a course of 146°T. A sextant observation of the Sun's lower limb is made at 0915 ZT. The chronometer reads 10h 14m 27s, and the sextant altitude is 25°29.8'. The index error is 3.1' off the arc, and the chronometer error is 0m 53s slow. Your height of eye on the bridge is 48.0 feet. What is the azimuth (Zn) of this sight using the assumed position? 

    Y a. 049.5°T
    N b. 052.6°T
    N c. 054.3°T
    N d. 058.9°T
2178: On 26 July , your 1901 ZT position is LAT 28°28'N, LONG 157°16'E when you take an observation of Jupiter. The chronometer at the time of the sight reads 08h 54m 34s and is 06m 24s slow. The sextant altitude (hs) is 33°51.5'. The index error is 2.8'off the arc, and the height of eye is 48 feet. What are the azimuth (Zn) and intercept (a) for this sight using the assumed position? 

    N a. Zn 110.8°,  a 32.0' T
    N b. Zn 249.2°,  a 32.0' A
    Y c. Zn 248.2°,  a 34.2' T
    N d. Zn 290.8°,  a 44.2' A
2701: You are underway on course 204°T at a speed of 17.3 knots. You sight a light bearing 205°T at a radar range of 4.7 miles at 1222. If you change course at 1228, what is the course to steer to leave the light abeam to port at 1.5 miles? 

    N a. 223°T
    N b. 229°T
    Y c. 236°T
    N d. 240°T
2852: Your vessel is on a course of 129°T at 13 knots. At 1937 a light bears 151.5°T. At 2003 the light bears 174°T. At which time and distance off will your vessel be when abeam of this light? 

    N a. 2016, 2.8 miles
    N b. 2016, 3.9 miles
    Y c. 2021, 3.9 miles
    N d. 2021, 2.8 miles
2860: Your vessel is on a course of 144°T at 16 knots. At 0126 a light bears 166.5°T, and at 0152 the light bears 189°T.
At what time and at what distance off will your vessel be when abeam of the light? 

    N a. 0205, 4.1 miles
    Y b. 0210, 4.8 miles
    N c. 0215, 6.0 miles
    N d. 0220, 6.4 miles
2904: Your vessel is on course 093°T at 15 knots. At 1835 a light bears 136°T, and at 1857 the same light bears 170°T. What was your distance off the light at 1857? 

    N a. 6.0 miles
    N b. 6.4 miles
    Y c. 6.8 miles
    N d. 7.2 miles
3051: The propeller on a vessel has a diameter of 20.6 feet and a pitch of 23.4 feet. What would be the apparent slip if the vessel cruised 538 miles in a 24 hour day (observed distance) at an average RPM of 87? 

    Y a. -11.6%
    N b. +11.6%
    N c. -10.3%
    N d. +10.3%
3250: You are taking a time tick using the 1200 signal from Valparaiso, Chile. You hear a series of 1 second dashes followed by a 9 second silent period, then a long 1.3 second dash. At the beginning of the long dash, your comparing watch reads 12h 00m 18s. When compared to the chronometer, the comparing watch reads 12h 01m 23s, and the chronometer reads 11h 59m 35s. What is the chronometer error? 

    N a. 0m 18s fast
    N b. 1m 05s fast
    N c. 0m 25s slow
    Y d. 1m 30s slow
10609: At 1922 your GPS position is LAT 41°04.9'N, LONG 72°42.1'W. You are on course 085° per standard magnetic compass at a speed of 10 knots. At 2019 your GPS position is 1 mile due south of Twenty-Eight Foot Shoal Lighted Buoy "TE". What were your set and drift? 

    Y a. 343°T at 0.7 knot
    N b. 340°T at 1.2 knots
    N c. 164°T at 0.9 knot
    N d. 161°T at 1.1 knots
10707: At 0726 you depart Lake Montauk with light 1 close aboard and set course 065° per standard magnetic compass at 6.7 knots. At 0912 your GPS position is LAT 41°12.8'N, LONG 71°48.2'W. What is the current? 

    N a. 151°T at 1.0 knot
    N b. 164°T at 0.7 knot
    Y c. 287°T at 2.0 knots
    N d. 321°T at 0.8 knot
11700: What is the true heading to steer outbound in Thimble Shoal Channel if your engines are turning for 8.0 knots, the current is 050°T at 1.0 knot and a northerly wind causes 3° of leeway? 

    Y a. 111°T
    N b. 104°T
    N c. 101°T
    N d. 098°T
12502: You are on course 262° per standard magnetic compass when you take the following bearings: Cape Henry Light 252°psc Cape Charles Light 003°psc Chesapeake Light 131°psc What is your position? 

    Y a. LAT 36°59.0'N, LONG 75°52.9'W
    N b. LAT 36°58.1'N, LONG 75°52.6'W
    N c. LAT 36°57.9'N, LONG 75°53.2'W
    N d. LAT 36°58.6'N, LONG 75°52.2'W
12506: You are on course 203° per standard magnetic compass when you take the following bearings: New Point Comfort Spit Light 2 267°psc Horn Harbor Entrance Light HH 304°psc Wolf Trap Light 006°psc What is the position of the fix? 

    N a. LAT 37°18.9'N, LONG 76°10.4'W
    Y b. LAT 37°18.8'N, LONG 76°10.8'W
    N c. LAT 37°18.7'N, LONG 76°11.1'W
    N d. LAT 37°18.5'N, LONG 76°10.7'W
13405: At 0400 your vessel is dead in the water and in heavy fog. Your GPS position is LAT 41°12.1'N, LONG 72°43.5'W. Bottom samples are taken and indicate a composition of soft mud and shell. Your fathometer reads 40 feet. If the vessel draws 9 feet of water, which of the following is TRUE? 

    Y a. The bottom samples and fathometer reading prove the fix is reliable.
    N b. The bottom samples and fathometer readings indicate that the fix is unreliable.
    N c. The information collected indicates that the fathometer may be in error.
    N d. The information collected indicates that the chart is most  likely in error.
15027: You are passing the Memphis Gage at 0405, 18 March. If you are turning for 8 mph and estimate the current at 0.9 mph, what is your ETA at Cairo Point, IL (mile 954.5 AHP)? 

    N a. 0447, 19 Mar
    Y b. 1052, 19 Mar
    N c. 1518, 19 Mar
    N d. 1808, 19 Mar
15066: If you correct for the current in the preceding question (035°T at 0.5 knot) and maintain an engine speed of 7.5 knots, what is your ETA 0.5 mile south of buoy "W"? 

    N a. 1016
    Y b. 1021
    N c. 1026
    N d. 1030
15118: What was the speed made good from 1845 to 1930? 

    N a. 6.2 knots
    N b. 7.5 knots
    Y c. 8.3 knots
    N d. 9.4 knots
15627: What is the vertical clearance of the Natchez Highway Bridge (westbound) when the river level is the same as the Low Water Reference Plane (6.1 ft)? 

    N a. 102.2 ft
    N b. 108.3 ft
    Y c. 119.4 ft
    N d. 125.6 ft
15630: The area between Island 67 Upper Light (mile 623.1 AHP) and Sunflower Cut-off Foot Light (mile 624.8 AHP) is known as a __________. 

    N a. transit
    N b. chute
    Y c. crossing
    N d. slough
15813: According to the DR track line from your 0100 position, how far off Roanoke Point Shoal Buoy "5" should you be when the buoy is abeam? 

    N a. 0.2 mile
    Y b. 0.6 mile
    N c. 1.3 mile
    N d. 1.8 miles
15840: You should expect to pass how far off buoy "12"? 

    Y a. 0.8 mile
    N b. 1.2 miles
    N c. 1.7 miles
    N d. 2.1 miles
15857: You are southeast of Saybrook Breakwater Light passing a horizontally-banded buoy. This buoy marks __________. 

    N a. a sunken wreck
    N b. a tide rips area
    N c. the junction with the Connecticut River
    Y d. shoal water
16039: From your 0820 position you change course to your rendezvous position, one mile due south of buoy "NH", speed 14.5 knots. You estimate the current to be 260°T at 0.5 knot. The wind is northwesterly at 20 knots and you estimate 2° leeway. What is your course per gyrocompass (pgc) to the rendezvous position, if you correct your heading for current and leeway? 

    N a. 039°
    N b. 041°
    N c. 043°
    Y d. 045°
16106: At 0410, you take the following bearings:
New Point Comfort Light "2" 242°T
Wolf Trap Light 313°T
Horn Harbor Entrance Light "HH" 262°T

What is your 0410 position? 

    Y a. LAT 37°21.0'N, LONG 76°08.1'W
    N b. LAT 37°21.0'N, LONG 76°08.8'W
    N c. LAT 37°21.1'N, LONG 76°07.9'W
    N d. LAT 37°21.2'N, LONG 76°08.2'W
16243: At 2207 Cape Charles Light bears 276°T, Chesapeake Light bears 194°T, and Cape Charles Lighted Bell Buoy "14" bears 312°T and is 2.0 miles off. What were the set and drift of the current acting on your vessel from 2129 to 2207? 

    N a. 258°T at 2.4 knots
    N b. 258°T at 1.5 knots
    N c. 078°T at 1.5 knots
    Y d. 078°T at 2.4 knots
16258: What is the course to steer per standard magnetic compass from the anchorage to point A, if easterly winds are causing 3° of leeway? 

    N a. 187°
    Y b. 191°
    N c. 194°
    N d. 197°
16411: You get underway at 1030. The wind is out of the SSE and you estimate 3° leeway. What course should you steer per gyrocompass to make good a desired course of 075°T? 

    N a. 074°pgc
    N b. 076°pgc
    N c. 078°pgc
    Y d. 080°pgc
16506: At 0630, you pass Buoy "PI" close abeam on the starboard side. You are steering 078°T and are headed directly toward Race Rock Light. At 0654, Little Gull Island Light is bearing 207°T and Race Rock Light is bearing 072°T. What is your 0654 position? 

    Y a. LAT 41°14.0'N, LONG 72°05.3'W
    N b. LAT 41°14.2'N, LONG 71°54.6'W
    N c. LAT 41°14.4'N, LONG 72°06.8'W
    N d. LAT 41°19.0'N, LONG 72°05.2'W
16509: At 0705, with your gyro again functioning properly, you change course to 096°T. At this time Race Rock Light is bearing 000°T at 0.35 mile. You are now governed by which Navigation Rules? 

    N a. Inland Rules
    N b. Local Pilot Rules
    Y c. International Rules
    N d. Coastal Fishery Rules