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.
174: Which of the following concerning Thimble Shoal Channel is TRUE?
N a. Only deep-draft passenger ships and large naval vessels may use the main channel. Y b. A tow drawing 20 feet is excluded from the main channel. N c. The channel is 14.5 miles in length. N d. Thimble Shoal Channel is in international waters. 180: On 4 July you observe the lower limb of the Sun at a sextant altitude (hs) of 25°29.8'. The index error is 3.1' off the arc. The height of eye is 48 feet (14.6 meters). What is the observed altitude (Ho)?
N a. 25°37.1' Y b. 25°40.2' N c. 25°42.8' N d. 25°44.3' 278: The National Weather Service provides 24 hour weather broadcasts to vessels transiting the Chesapeake Bay Bridge Tunnel area on which frequency?
Y a. 162.55 MHz N b. 162.85 MHz N c. 181.15 MHz N d. 202.35 MHz 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?
N a. 3.2 miles N b. 3.0 miles N c. 2.8 miles Y d. 2.6 miles 307: A vessel at LAT 28°00'N, LONG 116°00'W is to proceed to LAT 34°00'N, LONG 123°40'W. What is the course and distance by mid-latitude sailing?
N a. 323°T, 428 miles N b. 324°T, 453 miles Y c. 312°T, 533 miles N d. 302°T, 539 miles 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 381: At 1540, your position is LAT 37°18.4'N, LONG 76°10.5'W. Which course should you steer per gyrocompass to head for the entrance to Cape Charles City?
Y a. 129°pgc N b. 123°pgc N c. 117°pgc N d. 109°pgc 401: Your vessel receives a distress call from a vessel reporting her position as LAT 35°01'S, LONG 18°51'W. Your position is LAT 30°18'S, LONG 21°42'W. Determine the true course from your vessel to the vessel in distress by Mercator sailing.
N a. 135°T N b. 149°T Y c. 153°T N d. 160°T 427: Assuming no current, at what time can you expect to be abeam of Townshend Ledge Lighted Buoy?
Y a. 0910 N b. 0905 N c. 0902 N d. 0859 435: Which course should you change to per standard magnetic compass as you pass SW Ledge Light to remain in the channel?
N a. 026°psc Y b. 022°psc N c. 014°psc N d. 007°psc 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 605: At 0915 ZT, on 26 July , you depart Yokohama, LAT 35°27.0'N, LONG 139°39.0'E (ZD -9). You are bound for Seattle, LAT 47°36.0'N, LONG 122°22.0'W, and you estimate your speed of advance at 14 knots. The distance is 4,245 miles. What is your estimated ZT of arrival at Seattle?
Y a. 0728, 7 August N b. 1528, 7 August N c. 0028, 8 August N d. 1528, 8 August 625: You are on a voyage from Boston, MA, to the South Pass, LA. The distance is 1870 miles, and the speed of advance is 13.6 knots. You estimate 16.5 hours for bunkering enroute at Port Everglades, FL. If you sailed at 0836 hours (ZD +5), 26 February , what was your ETA (ZD +6) at the South Pass?
N a. 2336, 3 March N b. 1136, 4 March N c. 1236, 4 March Y d. 1736, 4 March 666: You are on a voyage via position LAT 44°00'N, LONG 150°00'E to LAT 46°15'N, LONG 124°00'W. Using gnomonic chart WOXZC 5270, determine which statement is TRUE?
Y a. A composite sailing with a limiting latitude of 51°N will clear the Aleutian Islands. N b. The northern hemisphere vertex is east of the arrival position. N c. The Aleutian Islands are not a navigational hazard on the direct great circle track. N d. The final course angle lies in the northeast quadrant. 667: You are planning a voyage from departure Seattle (LAT 48°30'N, LONG 125°00'W) to a position at LAT 44°00'N, LONG 161°00'E. Which statement is TRUE? (Use gnomonic chart WOXZC 5270.)
N a. You must plot a composite sailing to remain south of the Aleutians. N b. The northern hemisphere vertex lies to the west of your arrival position. Y c. Military exercises north of 53°N, between 150°W and 165°W, will not affect your voyage. N d. At your highest latitude, the sun will be visible at upper and lower transit if the voyage occurs on 21 June. 748: On 7 May , you observe Polaris for latitude at 0303 ZT. Your DR position is LAT 56°35.4'N, LONG 05°38.9'W. The sextant altitude is 56°11.1'. The height of eye is 36', and the index error is 3.3' off the arc. What is the latitude at the time of the sight?
N a. 56°24.6'N N b. 56°32.6'N N c. 56°35.0'N Y d. 56°38.7'N 1002: On 13 November , your 1030 ZT DR position is LAT 19°03'S, LONG 6°34'E. You are on course 164°T, speed 12 knots. Determine your 1200 position using the following observations of the Sun.
ZONE TIME GHA DECLINATION Ho
1112 351°55.4' S 18°00.4' 88°08.0'
1121 354°10.4' S 18°00.5' 88°33.9'
Y a. LAT 19°22.3'S, LONG 6°37.8'E N b. LAT 19°20.1'S, LONG 6°41.4'E N c. LAT 19°17.6'S, LONG 6°39.2'E N d. LAT 19°15.8'S, LONG 6°36.8'E 1142: At 1132, 24 May, you pass Natchez Beam Lt. (mile 364.8 AHP). What is your ETA off the Memphis Gage if you average 8.0 mph?
N a. 2345, 25 May Y b. 0947, 26 May N c. 1525, 26 May N d. 2215, 26 May 1224: What is the total length of the trip?
N a. 906.3 miles Y b. 922.3 miles N c. 1155.8 miles N d. 1187.3 miles 1745: What is the distance in river miles, from the mouth of the Yazoo Diversion Canal to the RR and Hwy bridge at Baton Rouge, LA?
N a. 365 miles N b. 310 miles N c. 265 miles Y d. 203 miles 1760: 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 Y b. crossing N c. chute N d. slough 1839: What are the dimensions of the channel maintained from Baton Rouge to New Orleans, LA?
N a. 30 feet x 300 feet N b. 40 feet x 300 feet N c. 30 feet x 500 feet Y d. 45 feet x 500 feet 2052: The highest point on your towboat is 48 feet above the water, and the Memphis Gage reads +7.5 feet. What is the vertical clearance when you pass under the Hernando Desoto Bridge in Memphis?
Y a. 53.2 feet N b. 58.1 feet N c. 68.2 feet N d. 96.3 feet 2185: At 1000 ZT, on 21 October , your DR position is LAT 29°00'N, LONG 134°40'E. Determine the computed altitude (Hc) of the Sun for the assumed position (AP) nearest to the above given latitude and longitude, given a chronometer time of 01h 00m 00s.
N a. Hc 42°30.6' N b. Hc 42°32.1' N c. Hc 42°34.2' Y d. Hc 42°35.7' 2320: The highest point on your towboat is 48 feet above the water, and the Memphis Gage reads +7.5 feet. What is the vertical clearance when you pass under the Hernando Desoto Bridge in Memphis?
N a. 48.0 feet Y b. 53.2 feet N c. 68.2 feet N d. 116.0 feet 2333: You observe the lower limb of the Sun at a sextant altitude (hs) of 37°47.2' on 11 October . The index error is 3.0' off the arc. The height of eye is 63 feet (19.2 meters). What is the observed altitude (Ho)?
N a. 37°25.2' N b. 37°42.5' N c. 37°51.5' Y d. 37°57.5' 2675: At 1423 you are on course 072 T° at 12.2 knots, when you sight a rock awash bearing 070°T at a range of 3.6 miles. If you change course at 1427, what course would you steer to leave the rock 1.0 mile abeam to port?
N a. 049° N b. 054° N c. 086° Y d. 091° 2703: You are underway on course 254°T at a speed of 16.5 knots. You sight a rock bearing 255°T at a radar range of 6.1 miles at 0916. If you change course at 0922, what is the course to steer to leave the rock abeam to starboard at 1.5 miles?
N a. 268°T N b. 239°T Y c. 236°T N d. 233°T 2712: What is the length of the trip?
N a. 720.8 miles N b. 777.4 miles Y c. 897.2 miles N d. 906.3 miles 2855: Your vessel is on a course of 107°T at 16 knots. At 0403 a light bears 129.5°T, and at 0426 the light bears 152°T. At what time and at what distance off will your vessel be when abeam of the light?
N a. 0434, 3.2 miles Y b. 0442, 4.3 miles N c. 0434, 4.3 miles N d. 0442, 3.4 miles 2912: Your vessel is on a course of 079°T at 11 knots. At 0152 a light bears 105.5°T, and at 0209 the light bears 124°T.
At what time and at what distance off will your vessel be when abeam of the light?
N a. 0219, 2.3 miles Y b. 0226, 3.1 miles N c. 0233, 3.9 miles N d. 0242, 4.7 miles 3071: If the speed necessary for reaching port at a designated time is 20.7 knots and the pitch of the propeller is 23.8 feet, how many revolutions per minute will the shaft have to turn, assuming a 3% negative slip?
N a. 74 N b. 79 Y c. 86 N d. 98 3257: You have steamed 824 miles at 15.5 knots, and consumed 179 tons of fuel. If you have 221 tons of usable fuel remaining, how far can you steam at 18 knots?
N a. 495 miles N b. 650 miles Y c. 754 miles N d. 876 miles 3647: The true course between two points is 220°. Your gyrocompass has an error of 1°E. You make an allowance of 1° leeway for a north-northwest wind. What gyro course should be steered to make the true course good?
Y a. 220°pgc N b. 221°pgc N c. 222°pgc N d. 223°pgc 3752: While your vessel is proceeding down a channel you notice a range of lights in line with your vessel's mast. If your vessel is on course 001° per gyro compass and the charted value of the range of lights is 359°T, what is the gyro compass error?
Y a. 2°W N b. 2°E N c. 1°E N d. 1°W 4014: You swung ship and compared the magnetic compass against the gyro compass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a true heading of 157°.
HEADING HEADING HEADING
PSC PGC PSC PGC PSC PGC
358.5° - 354° 122.5° - 114° 239.5° - 234°
030.5° - 024° 152.0° - 144° 269.0° - 264°
061.5° - 054° 181.0° - 174° 298.0° - 294°
092.0° - 084° 210.0° - 204° 327.5° - 324°`
N a. 2.0°W Y b. 1.5°W N c. 1.0°W N d. 0.0° 10504: At 1354 your GPS indicates a position of LAT 37°00.0'N, LONG 75°45.8'W. You are on course 088° per standard magnetic compass at a speed of 9.5 knots. At 1500 your GPS indicates your position as LAT 37°01.6'N, LONG 75°31.7'W. What were the set and drift?
N a. 273°T at 0.8 knot N b. 241°T at 1.1 knots N c. 061°T at 1.3 knots Y d. 092°T at 0.9 knot 10900: The abandoned lighthouse west of Cape Henry Light is __________.
N a. painted black and white N b. a low mound of rubble Y c. a gray, pyramidal structure N d. a steel skeleton structure 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 13703: NOAA weather broadcasts can be received on what frequency while navigating off Cape Henry?
N a. 162.45 MHz Y b. 162.55 MHz N c. 162.65 MHz N d. 162.70 MHz 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 15215: At 2015, you alter course to 154°pgc. What is the course per standard magnetic compass (psc)?
Y a. 162°psc N b. 157°psc N c. 152°psc N d. 142°psc 15268: Your vessel is proceeding up New London Harbor Channel, and you are in line with the range. What would be your course per standard magnetic compass?
N a. 352° N b. 354° N c. 002° Y d. 007° 15815: From your 0130 position, you take the following radar ranges:
Mattituck Inlet Light @ 4.6 nm
Falkner Island Light @ 10.75
What is the latitude and longitude of the fix?
N a. LAT 41°00.8'N, LONG 72°40.8'W N b. LAT 41°01.2'N, LONG 72°40.4'W N c. LAT 41°01.6'N, LONG 72°40.0'W Y d. LAT 41°02.0'N, LONG 72°39.5'W 15906: As you enter the New Haven Outer Channel, you sight the range markers in line directly over the stern. Your heading at the time is 155.5° per gyrocompass. What is the gyro error?
N a. 1.0°E N b. 1.0°W Y c. 2.0°W N d. 0° 16019: The south shore of Long Island Sound from Horton Point to Orient Point is __________.
N a. low and marshy Y b. bluff and rocky N c. marked by sandy beaches and wooded uplands N d. bound by gradual shoaling 16320: Which course should you change to per standard magnetic compass as you pass SW Ledge Light to remain in the channel?
N a. 007°psc N b. 014°psc Y c. 021°psc N d. 026°psc 16370: The wind is westerly and will cause 2° of leeway. The current is 180° at 0.5 knot. If your engines are turning for 8.0 knots, what should you steer to remain in York River Entrance Channel?
N a. 304°T N b. 307°T Y c. 311°T N d. 314°T 16615: At 0112, the radar range to Branford Reef Light is 2.9 miles. At 0125, the range is 3.6 miles. What is the position of your 0125 running fix if you are steering 124°T at 12 knots?
Y a. LAT 41°09.7'N, LONG 72°48.1'W N b. LAT 41°09.7'N, LONG 72°48.7'W N c. LAT 41°09.8'N, LONG 72°47.2'W N d. LAT 41°10.2'N, LONG 72°47.7'W