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.

79: The map shows a circle with two black quadrants located at mile 846.4 AHP. What does this indicate?
171: At 2015, your vessel is at the Chesapeake Bay Bridge and Tunnel midway between buoys "13" and "14". If the height of tide is -1 foot (-0.3 meters), what is the approximate depth of water?
274: At what approximate distance would you expect Bartlett Reef Light to break the horizon, if the visibility is 27 nautical miles?
289: At 1930, you take a fix using the following radar ranges:
York Spit Light - 3.6 miles;
New Point Comfort Spit Light "2" - 2.0 miles;
York Spit Swash Channel Light "3" - 2.5 miles.

Your longitude is __________. 

    N a. 76°16.2'W
    N b. 76°16.5'W
    Y c. 76°16.8'W
    N d. 76°17.2'W
359: You are turning for 9 knots, a westerly wind is causing 3°
of leeway, and the current is 320°T at 1.2 knots. What true course should you steer to remain in the northern leg of York Spit Channel? 

    N a. 203°T
    N b. 197°T
    Y c. 194°T
    N d. 191°T
380: A vessel at LAT 21°18.5'N, LONG 157°52.2'W, heads for a destination at LAT 8°53.0'N, LONG 79°31.0'W. Determine the true course and distance by Mercator sailing. 

    N a. 081°T, 4617.5 miles
    N b. 081°T, 4915.8 miles
    Y c. 099°T, 4617.5 miles
    N d. 099°T, 4915.8 miles
410: A vessel steams 666 miles on course 135°T from LAT 40°24.0'N, LONG 74°30.0'W. What is the latitude and longitude of the point of arrival by Mercator sailing? 

    N a. LAT 32°30.0'N, LONG 64°41.0'W
    Y b. LAT 32°33.0'N, LONG 64°46.0'W
    N c. LAT 32°36.0'N, LONG 64°49.0'W
    N d. LAT 32°39.0'N, LONG 64°53.0'W
463: Determine the great circle distance and initial course from LAT 37°47.5'N, LONG 122°27.8'W to LAT 33°51.7'S, LONG 151°12.7'E. 

    N a. 6324.2 miles, 310.3°T
    N b. 6345.3 miles, 301.7°T
    N c. 6398.0 miles, 298.3°T
    Y d. 6445.2 miles, 240.3°T
479: The great circle distance from LAT 24°25.3'N, LONG 83°02.6'W to LAT 35°57.2'N, LONG 5°45.7'W is 3966.5 miles. Determine the latitude of the vertex. 

    N a. 38°46.2'N
    N b. 38°16.4'N
    Y c. 38°09.4'N
    N d. 37°57.3'N
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
618: Your vessel departs Seattle at 1010 zone time (ZD +8), on 28 May, bound for Apra, Guam (ZD -10). The distance by great circle is 4,948 miles, and you estimate that you will average 18.5 knots. What is your estimated zone time of arrival? 

    Y a. 0737,  9 June
    N b. 1737,  9 June
    N c. 1937,  9 June
    N d. 0737, 10 June
980: On 29 April , your 0530 zone time position was LAT 23°04.0'S, LONG 162°12.0'E. Your vessel was steaming on course 120°T at a speed of 9.0 knots. An observation of the Sun's upper limb was made at 0830 ZT. The chronometer read 09h 27m 32s and was slow 02m 24s. The observed altitude (Ho) was 24°58.0'. LAN occurred at 1205 zone time. The observed altitude (Ho) was 52°04.0'. What was the longitude of your 1200 zone time running fix? 

    N a. LONG 163°02.1'E
    Y b. LONG 163°06.0'E
    N c. LONG 163°09.5'E
    N d. LONG 163°11.3'E
998: On 23 May , your 0628 zone time position was LAT 28°18.0'S, LONG 102°42.0'E. Your vessel was steaming on course 040°T at a speed of 20.0 knots. An observation of the Sun's lower limb was made at 0758 ZT. The chronometer read 01h 02m 06s and was fast 04m 04s. The observed altitude (Ho) was 13°16.7'. LAN occurred at 1201 zone time. The observed altitude (Ho) was 42°32.0'. What was the longitude of your 1201 zone time running fix? 

    N a. 103°57.9'E
    N b. 104°00.4'E
    Y c. 104°03.5'E
    N d. 104°06.3'E
1141: Which daymark will you see as you approach Natchez Beam Lt. (mile 364.8 AHP)? 

    Y a. Red triangle
    N b. White square
    N c. Green square
    N d. Red diamond
1192: On 3 October , your 0830 ZT position is LAT 26°15.0'S, LONG 73°16.0'E. Your vessel is on course 280°T at a speed of 19.0 knots. What is the ZT of local apparent noon (LAN)? 

    N a. 1151
    N b. 1154
    N c. 1158
    Y d. 1201
1193: On 26 September , your 0830 zone time DR position is LAT 23°04.0'N, LONG 129°16.0'E. Your vessel is on course 119°T at a speed of 20.0 knots. What is the zone time of local apparent noon (LAN)? 

    N a. 1158
    N b. 1205
    Y c. 1210
    N d. 1214
1236: Which facility is located on the right descending bank at mile 363.6 AHP? 

    N a. River Cement Corps..
    N b. Bunge Corps..
    N c. T.L. James
    Y d. Vidalia Dock and Storage Co.
1650: On 22 October , in DR position LAT 21°51.0'S, LONG 76°24.0'E, you observe an amplitude of the Sun. The Sun's center is on the visible horizon and bears 256°psc. The chronometer reads 01h 01m 25s and is 01m 15s fast. Variation for the area is 2°E. What is the deviation of the standard magnetic compass? 

    N a. 0.3°E
    Y b. 0.3°W
    N c. 2.0°E
    N d. 2.0°W
1889: On 22 July , your 1759 DR position is LAT 24°50.2'S, LONG 05°16.0'E. You observe an unidentified star bearing 293°T at an observed altitude (Ho) of 17°52.8'. The chronometer reads 06h 01m 31s, and is 02m 15s fast. What star did you observe? 

    Y a. Regulus
    N b. Antares
    N c. Miaplacidus
    N d. Suhail
1894: On 22 July , your 0442 DR position is LAT 26°35.6'N, LONG 22°16.7'W. You observe an unidentified star bearing 149°T at an observed altitude (Ho) of 12°55.0'. The chronometer reads 05h 39m 03s, and is 03m 14s slow. What star did you observe? 

    N a. Hamal
    N b. Rigel
    N c. Menkar
    Y d. Acamar
2182: On 18 August , at 0600 ZT, morning stars were observed, and the vessel's position was determined to be LAT 19°48'N, LONG 108° 34'W. Your vessel is steaming on course 166°T at a speed of 16 knots. An observation of the Sun's lower limb is made at 1036 ZT. The chronometer reads 05h 34m 48s and is slow 01m 24s. What is the computed altitude (Hc) and azimuth (Zn) for this 1036 ZT observation using the assumed position method? 

    N a. Hc 65°18.5', Zn 102.1°
    Y b. Hc 65°14.8', Zn 100.4°
    N c. Hc 65°11.3', Zn 099.4°
    N d. Hc 65°07.2', Zn 101.2°
2182: On 18 August , at 0600 ZT, morning stars were observed, and the vessel's position was determined to be LAT 19°48'N, LONG 108° 34'W. Your vessel is steaming on course 166°T at a speed of 16 knots. An observation of the Sun's lower limb is made at 1036 ZT. The chronometer reads 05h 34m 48s and is slow 01m 24s. What is the computed altitude (Hc) and azimuth (Zn) for this 1036 ZT observation using the assumed position method? 

    N a. Hc 65°18.5', Zn 102.1°
    Y b. Hc 65°14.8', Zn 100.4°
    N c. Hc 65°11.3', Zn 099.4°
    N d. Hc 65°07.2', Zn 101.2°
2280: You observe the lower limb of the Sun at a sextant altitude (hs) of 28°24.7' on 17 May . The index error is 1.5' off the arc. The height of eye is 86 feet (26 meters). What is the observed altitude (Ho)? 

    N a. 28°29.7'
    N b. 28°30.6'
    Y c. 28°31.5'
    N d. 28°32.9'
2319: You complete changing out your tow and get underway enroute Ark City Tank Storage (mile 554.0 AHP) to deliver the tank barges. What is the distance you must travel from Cairo Point Light? 

    N a. 606.8 miles
    N b. 554.0 miles
    Y c. 399.8 miles
    N d. 202.1 miles
2367: At 0850, 4 January, you pass the Gage at Natchez, MS which reads 26.8 feet. The low water reference plane (LWRP) for Natchez is 6.1 feet. What is the water level in relation to the low water reference plane? 

    N a. 20.7 ft below
    Y b. 20.7 ft above
    N c. 32.9 ft below
    N d. 32.9 ft above
2405: You are underway and intend to make good a course of 350°T. You experience a current with a set and drift of 070°T at 1.5 knots, and a westerly wind produces a leeway of 4°. You adjust your course to compensate for the current and leeway, while maintaining an engine speed of 10 knots. What will be your speed made good over your intended course of 350°T? 

    N a. 9.4 knots
    N b. 9.8 knots
    Y c. 10. 2knots
    N d. 10.6 knots
2535: What is the mile point of Hickman, KY Gage? 

    N a. 846.4 AHP
    N b. 889.0 AHP
    Y c. 922.0 AHP
    N d. 937.2 AHP
2536: You have steamed 463 miles at 19 knots and burning 440 barrels of fuel per day. You must decrease your consumption to 200 barrels per day with 410 miles left in your voyage. What must you reduce your speed (kts) to in order to burn this amount of fuel? 

    N a. 12.1
    Y b. 13.6
    N c. 15.2
    N d. 17.5
2692: While on a course of 097°pgc, a light bears 8° on the port bow at a distance of 11.7 miles. What course should you steer to pass 3 miles abeam of the light leaving it to port? 

    N a. 082°pgc
    N b. 091°pgc
    Y c. 104°pgc
    N d. 112°pgc
2864: You are steering a course of 316°T, and a light bears 34° on the port bow at 2053. At 2126 the same light bears 68° on the port bow, and you have run 5 miles since the first bearing. What is the ETA when the lighthouse is abeam? 

    Y a. 2139
    N b. 2143
    N c. 2149
    N d. 2159
2866: Your vessel is on a course of 311°T at 21 knots. At 1957 a light bears 337.5°T, and at 2018 the light bears 356°T. At what time and at what distance off will your vessel be when abeam of the light? 

    N a. 2027, 5.2 miles
    N b. 2033, 6.8 miles
    Y c. 2039, 7.4 miles
    N d. 2043, 10.3 miles
2888: Your vessel is underway on a course of 323.5°T at a speed of 16 knots. At 1945° a light bears 350°T. At 2010 the light bears 008.5°T. What will be your distance off when abeam of the light? 

    N a. 3.3 miles
    N b. 4.8 miles
    Y c. 6.7 miles
    N d. 8.7 miles
3104: You are turning 84 RPM, with a propeller pitch of 22 feet, and an estimated slip of 0%. What is the speed of advance? 

    N a. 16.8 knots
    N b. 17.7 knots
    N c. 18.0 knots
    Y d. 18.2 knots
3760: Your vessel is proceeding up a channel, and you see a pair of range lights that are in line ahead. The chart indicates that the direction of this pair of lights is 352°T, and the variation is 4°W. If the heading of your vessel at the time of the sighting is 359° per standard magnetic compass, what is the correct deviation? 

    Y a. 3°W
    N b. 7°E
    N c. 11°E
    N d. 11°W
11108: The passage between Great Gull Island and Plum Island __________. 

    N a. is subject to weak and variable tidal currents
    N b. uncovers at extreme low water
    Y c. should be avoided
    N d. shows a whirlpool at maximum ebb current when accompanied by NW gales
11701: What is the true heading to steer inbound in the York River Entrance Channel if your engines are turning for 9.5 knots, the current is 076°T at 1.2 knots, and a southwesterly wind causes 3° of leeway? 

    N a. 313°T
    N b. 308°T
    N c. 303°T
    Y d. 300°T
11907: Your position is 3 miles due east of Montauk Point Light. What is the course to steer to arrive at LAT 41°00.0'N, LONG 71°30.0'W, if you are turning for 7.8 knots, the current is 130° at 1.2 knots, and a southerly wind causes 3° of leeway? 

    N a. 112°T
    Y b. 108°T
    N c. 105°T
    N d. 102°T
12508: You are on course 319° per standard magnetic compass when you take the following bearings: New Point Comfort Light "2" 244°psc Horn Harbor Entrance Light "HH" 267°psc Wolf Trap Light 335°°psc What is the position of the fix? 

    N a. LAT 37°20.9'N, LONG 76°09.7'W
    N b. LAT 37°21.0'N, LONG 76°09.2'W
    N c. LAT 37°21.0'N, LONG 76°09.9'W
    Y d. LAT 37°21.1'N, LONG 76°09.5'W
12604: You are on course 082° per standard magnetic compass (psc) when you take the following bearings: New London Ledge Light - 036.5°psc Little Gull Island Light - 157.0°psc Saybrook Break Water Light - 294.5°psc What is your position? 

    N a. LAT 41°02.3'N, LONG 72°04.5'W
    N b. LAT 41°09.5'N, LONG 72°07.1'W
    Y c. LAT 41°13.6'N, LONG 72°07.5'W
    N d. LAT 41°14.1'N, LONG 72°12.8'W
13107: At 1103 your position is LAT 41°12.5 N, LONG 71°37.4 W. What is your ETA at the west gap of Point Judith Harbor of Refuge if you make good 11.3 knots? 

    N a. 1144
    N b. 1154
    Y c. 1159
    N d. 1205
14401: You are underway and steaming in an easterly direction on the Columbia River. Your vessel is positioned in the middle half of Cape Horn Channel and is abeam of Cape Horn Light. What should your fathometer read at this position, if the staff gauge at Portland reads 0 feet? 

    N a. 16 feet
    N b. 18 feet
    Y c. 22 feet
    N d. 24 feet
14604: Contour elevations on this chart refer to heights in feet above mean __________. 

    N a. lower low water
    N b. high water
    N c. low water
    Y d. sea level
15022: You are upbound approaching Springfield Bend Lt. (mile 244.8 AHP) downriver from Profit Island. Which of the following statements is TRUE? 

    N a. Profit Island Chute is open to navigation and is a shortcut for single-barge tows.
    N b. Tow length must not exceed 600 feet to use Profit Island Chute.
    Y c. Profit Island Chute is closed to navigation.
    N d. Tows must navigate towards right descending bank when passing Profit Island Chute.
15245: After departing the New Haven terminals, your 1800 position puts the New Haven Harbor Lighted Bell Buoy "NH" bearing 130°T at a range of 0.2 mile. From this position you set a course to leave Stratford Shoal Middle Ground Light 1.0 mile off your starboard beam. Your speed is 12.5 knots. At 1845 you determine your position to be LAT 41°05.5'N,
LONG 73°03.1'W. What were the set and drift of the current? 

    N a. 294°T at 0.5 knot
    Y b. 294°T at 0.8 knot
    N c. 114°T at 0.5 knot
    N d. 114°T at 0.8 knot
15261: You make good 097°T from your 0830 fix. With a westerly current of 1.2 knots, what engine speed will you have to turn for from your 0830 position in order to arrive abeam of Six Mile Reef Buoy "8C" at 1030? 

    N a. 9.7 knots
    Y b. 10.5 knots
    N c. 10.9 knots
    N d. 12.1 knots
15364: At 0615, Stratford Point Light bears 292°pgc, Falkner Island Light bears 052°pgc, and Branford Reef Light bears 018°pgc. What was the current since 0530? 

    Y a. 083° at 1.2 knots
    N b. 083° at 0.9 knots
    N c. 263° at 1.2 knots
    N d. 263° at 0.9 knots
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
15942: At 1959 Watch Hill Point Light bears 030°T, Montauk Point Light bears 146°T, and Little Gull Light bears 283°T. What is the approximate fathometer reading? 

    Y a. 51 feet
    N b. 73 feet
    N c. 95 feet
    N d. 111 feet
16062: At 1930, your vessel is between York River Entrance Channel Lighted Buoys "1YR" and "2". From this position, you change course to 142°pgc at an engine speed of 8.0 knots. At 2000, you take the following bearings: Chesapeake Channel Tunnel North Light - 131°pgc Thimble Shoal Light - 247°pgc
What were the set and drift between 1930 and 2000? 

    N a. 140°T at 0.2 knot
    Y b. 140°T at 0.4 knot
    N c. 320°T at 0.2 knot
    N d. 320°T at 0.4 knot
16140: Available information indicates that there is a set and drift in this area of 290°T at 2 knots. Allowing for this set and drift, what course must you steer to make good a true course of 150°, while maintaining an engine speed of 13 knots, from your 1930 position? 

    N a. 141°T
    Y b. 145°T
    N c. 149°T
    N d. 153°T
16356: What is the course per standard magnetic compass from the anchorage to point "A" located 0.5 mile east of Cape Charles Lighted Bell Buoy 14? 

    N a. 185°
    N b. 188°
    N c. 191°
    Y d. 194°
16361: At 0400, you take the following bearings:

Sand Shoal Inlet South Light bearing 305°pgc
Cape Charles Light bearing 241°pgc

What was the course made good since 0240? 

    N a. 182°T
    Y b. 185°T
    N c. 189°T
    N d. 192°T
16362: The visibility is about 5 miles. Which statement about Cape Charles Light is TRUE? 

    N a. The light has been visible from the time you departed the anchorage.
    Y b. You should see Cape Charles Light at about 0400.
    N c. The light will become visible when you enter the inbound leg of the traffic separation scheme.
    N d. The light will not be visible until you are within 5 miles of the light.
16407: At 0227, you are on course 087°T at 10 knots. What course per standard magnetic compass should you steer to make good your true course? 

    N a. 099°psc
    N b. 102°psc
    Y c. 105°psc
    N d. 109°psc
16538: At 2216 your position is LAT 41°16.0'N, LONG 72°08.0'W. Which statement is TRUE? 

    Y a. You are in the red sector of New London Harbor Light.
    N b. Your fathometer reads approximately 40 feet.
    N c. You will cross the Colregs Demarcation Line if you continue on your present course.
    N d. Little Gull Island Light bears 339°T at 4.3 miles.
16638: At 0400 your position is:

Latitude 40° 50.2' North
Longitude 071° 36.2' West

From your 0400 fix, you steer a course to make good 347°T at 12.5 knots. Visibility is good. What is the earliest time you can expect to raise Montauk Point Light? (Nominal range - 24 miles, height above water - 168 feet) 

    Y a. The light is visible at 0400.
    N b. 0426
    N c. 0435
    N d. 0442
16714: What was the current between 0520 and 0600? 

    N a. 201° at 1.0 knot
    N b. 201° at 1.5 knot
    N c. 021° at 1.0 knot
    Y d. 021° at 1.5 knots