Q140 - Navigation Problems: Chart Plot, USCG prep certification 2026

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1. The following questions are based on Chart 12221TR, Chesapeake Bay Entrance, and the supporting publications. Your vessel has a draft of 10 feet (3 meters) Your height of eye is 20 feet (6.1 meters) Gyro error is 3°E Variation is 10°W "Per standard magnetic compass" is abbreviated "psc" “Per gyrocompass” is abbreviated “pgc” DEVIATION TABLE Magnetic Heading Deviation 000° 0° 030° 1°W 060° 2°W 090° 4°W 120° 2°W 150° 1°W 180° 1°E 210° 2°E 240° 3°E 270° 3°E 300° 2°E 330° 1°E You are on course 192°pgc at 12 knots. At 1900 your position is: Latitude 37°22.6'N Longitude 075°35.7'W. Which of the following is true?Not learned 2. What course should you steer using the standard magnetic compass (psc) to make good the course of 192°pgc?Not learned 3. At 1920, the buoy forward of your starboard beam is __________.Not learned 4. At 1930, your position is LAT 37° 16.7' N, LONG 75° 37.7' W. The depth of water is approximately __________.Not learned 5. At 1950, your position is LAT 37°12.3'N, LONG 75°38.6'W. The set and drift from 1930 to 1950 were __________.Not learned 6. Assume set and drift have no effect on your vessel. If you change course to 187°pgc from your 1950 position, how close will you pass Cape Charles Lighted Bell Buoy "14"?Not learned 7. At 2020, you obtain a fix using the following information: Cape Charles Lighted Bell Buoy "14" bears 333° pgc Cape Charles Light bears 271.5° pgc Your longitude is __________.Not learned 8. At 2020, what is the course to steer to enter the inbound lane of North Chesapeake Entrance traffic separation scheme if a northwesterly wind causes 3° of leeway?Not learned 9. If you make good 12 knots, what is the ETA at North Chesapeake Channel Entrance Buoy "NCA" (LL #375)?Not learned 10. At 2100, Cape Charles Light bears 321°pgc, and Cape Henry Light bears 247°pgc. Your latitude is __________.Not learned 11. If the visibility is 3 miles, at what range will you lose sight of Chesapeake Light?Not learned 12. At 2100, you alter course to 250°T and reduce speed to 7 knots. You enter the traffic separation scheme on the inbound side. At 2200, your fix shows you crossing a broken purple line on the chart, and you observe North Chesapeake Entrance Lighted Gong Buoy "NCD" to port. This area is __________.Not learned 13. What course per standard magnetic compass (psc) is the same as 247°pgc?Not learned 14. At 2215 the following bearings are taken: Cape Henry Light: 242°pgc Cape Charles Light: 010 .5°pgc Chesapeake Channel Tunnel North Light: 319°pgc You are heading: 271°pgc What is the relative bearing of Thimble Shoal Light?Not learned 15. While navigating inbound in the Thimble Shoal Channel system you must __________.Not learned 16. The following questions are based on Chart 12221TR, Chesapeake Bay Entrance, and the supporting publications. Your height of eye is 25 feet (7.6 meters) Gyro error is 3°E Variation is 10°W "Per standard magnetic compass" is abbreviated "psc" “Per gyrocompass” is abbreviated “pgc” DEVIATION TABLE Magnetic Heading Deviation 000° 0° 030° 1°W 060° 2°W 090° 4°W 120° 2°W 150° 1°W 180° 1°E 210° 2°E 240° 3°E 270° 3°E 300° 2°E 330° 1°E On which frequency does the National Weather Service provide 24 hour weather broadcasts to vessels transiting the Chesapeake Bay Bridge Tunnel area?Not learned 17. At 1752, your position is LAT 37°04.3'N, LONG 76°06.4'W. On a flood current you should expect to be set in what direction?Not learned 18. Where does your 1752 position place you?Not learned 19. What is the average velocity of the maximum flood current at the Tail of the Horseshoe?Not learned 20. From your 1752 position, you steer 307°pgc at 9 knots. At 1805, you obtain the following visual bearings: Old Pt. Comfort Light 232°pgc Chesapeake Bay Tunnel North Light 130°pgc What are the latitude and longitude of your 1805 position?Not learned 21. At 1810, you sight a buoy on your starboard side labeled "19". What does this buoy mark?Not learned 22. Based on a DR, at approximately 1817 you should expect to do which of the following?Not learned 23. At 1845, you plot the following bearing lines: Old Plantation Flats Light bearing 071°true New Point Comfort Spit Light "2" bearing 335°true What is your latitude ?Not learned 24. Your 1900 position is LAT 37°12.9'N, LONG 76°13.5'W. You change course to 317°pgc and slow to 8.0 knots. What is the course per standard magnetic compass?Not learned 25. If the visibility is 11 miles, what is the luminous range of New Point Comfort Spit Light "4"?Not learned 26. According to your track line, how far off New Point Comfort Spit Light "4" will you be when abeam of this light?Not learned 27. At 1930, you take a fix using the following radar ranges: York Spit Light at 3.6 miles New Point Comfort Spit Light "2" at 2.0 miles York Spit Swash Channel Light "3" at 2.5 miles What is your longitude?Not learned 28. What was the speed made good from 1845 to 1930?Not learned 29. What is the height above water of Davis Creek Channel Light "1"?Not learned 30. 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?Not learned 31. The following questions are based on Chart 12221TR, Chesapeake Bay Entrance, and the supporting publications. The draft of your vessel is 9.0 feet (2.75 meters) Gyro error is 2°W Variation is 10°W "Per standard magnetic compass" is abbreviated "psc" “Per gyrocompass” is abbreviated “pgc” DEVIATION TABLE Magnetic Heading Deviation 000° 1.5°E 030° 2.0°E 060° 1.0°E 090° 0° 120° 1.0°W 150° 1.5°W 180° 2.5°W 210° 1.5°W 240° 1.0°W 270° 0.5°W 300° 0° 330° 0.5°E On 31 July, you are anchored at LAT 37°22.4'N, LONG 75°39.9'W You get underway at 0240 enroute to Yorktown, VA What is the course psc from the anchorage to point A located 0.5 mile east of Cape Charles Lighted Bell Buoy 14?Not learned 32. Which of the following describes the coast between Great Machipongo Inlet and Cape Charles?Not learned 33. If your engines turn for 6.5 knots, and you encounter a 0.5 knot southerly current, what is your ETA at point A?Not learned 34. What is the course to steer per gyrocompass from the anchorage to point "A" if easterly winds are causing 3° of leeway?Not learned 35. At 0250, Great Machipongo Inlet Light "5" (37°21.8'N, 75°43.7'W) bears 279°pgc. At 0320, the light bears 320° pgc. If you are making good 6.5 knots, what is the position of your 0320-running fix?Not learned 36. At 0400, you obtain the following information: Sand Shoal Inlet South Light bearing 303° true at 7.1nm What is your 0400 position?Not learned 37. The visibility is about 5 miles. Which statement about Cape Charles Light is TRUE?Not learned 38. Which statement about your 0400 position is TRUE?Not learned 39. At 0405, you increase speed. At 0500, your position is LAT 37°06.0'N, LONG 75°41.1'W. What is the approximate depth of the water under the keel?Not learned 40. At 0600, you are entering the inbound leg of the traffic separation scheme at position LAT 36°59.2'N, LONG 75°47.6' W. Course is 250°T. At 0605, Cape Henry Light bears 249°T At 0610, Cape Henry Light bears 248°T At 0625, Cape Henry Light bears 247°T Based on this, you know you are __________.Not learned 41. Which of the following is a characteristic of the abandoned lighthouse at Cape Henry?Not learned 42. Weather broadcasts for the Norfolk area are broadcast on which frequency?Not learned 43. \When Cape Henry Light is abeam, what is the approximate distance to Yorktown?Not learned 44. As you pass between trestle "B" and trestle "C" of the Chesapeake Bay Bridge - Tunnel, you sight along the trestle "C" when it is in line. The trestle bears 057° per standard magnetic compass while the vessel is heading 320°T. Which of the following can be determined from this information?Not learned 45. The wind is easterly 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?Not learned 46. The following questions should be answered using Chart 12354TR, Long Island Sound - Eastern Part, and the supporting publications. Your vessel has a draft of 10 feet (3.1 meters) Your height of eye is 35 feet (10.6 meters) Gyro error is 2°E Variation is 14°W "Per standard magnetic compass" is abbreviated "psc" “Per gyrocompass” is abbreviated “pgc” DEVIATION TABLE Magnetic Heading Deviation 000° 0° 030° 1°W 060° 2°W 090° 4°W 120° 2°W 150° 1°W 180° 1°E 210° 2°E 240° 3°E 270° 3°E 300° 2°E 330° 1°E At 0345 you set a course to depart New London Harbor. Assuming no set and drift, which course psc must you steer to stay in the middle of the channel?Not learned 47. Which statement regarding the wreck 0.2 mile south of buoys "1" and "2" at the entrance to New London Harbor is TRUE?Not learned 48. At 0530, your position is LAT 41°12.6'N, LONG 72°08.5'W. What is the color of New London Harbor Light?Not learned 49. From your 0530 position, you set a course of 271° psc with an engine speed of 9 knots. At 0645, Cornfield Safe-Water Buoy is abeam to starboard. What speed have you averaged since 0530?Not learned 50. At 0730, your position is LAT 41°10.5'N, LONG 72°32.2'W. From this position you steer course 286°psc with an engine speed of 9.0 knots. What is the approximate depth of water under your keel?Not learned 51. The broken magenta line which runs parallel to the shore between Roanoke Point and Mattituck Inlet marks a __________.Not learned 52. Assuming no current, at what time can you expect to be abeam of Townshend Ledge Lighted Buoy?Not learned 53. At 0730, visibility is 5.5 miles. At what time will you lose sight of Horton Point Light?Not learned 54. At 0820, you take the following bearings: Falkner Island Light: 052°t rue Branford Reef Light: 307°t What are the set and drift since 0730?Not learned 55. 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 __________.Not learned 56. At 0900, the current is flooding in a direction of 350°T at 1.2 knots. If your engines are turning RPMs for 9 knots, which course should you steer per standard magnetic compass to make good a course of 297° true?Not learned 57. Which chart would you use for more detailed information on New Haven Harbor?Not learned 58. What true course and speed did you make good between 0730 and 0900?Not learned 59. As you enter the New Haven Outer Channel, you sight the outer range markers in line directly ahead. Your heading at this time is 347°psc. What is your compass deviation by observation?Not learned 60. Which course should you change to per standard magnetic compass as you pass SW Ledge Light to remain in the channel?Not learned 61. The following questions should be answered using Chart 12354TR, Long Island Sound - Eastern Part, and the supporting publications. Your vessel has a draft of 9 feet (2.7 meters). Your height of eye is 25 feet (7.6 meters). Variation is 14°W "Per standard magnetic compass" is abbreviated "psc" “Per gyrocompass” is abbreviated “pgc” DEVIATION TABLE Magnetic Heading Deviation 000° 0.0° 030° 1.0°W 060° 3.0°W 090° 2.0°W 120° 1.0°W 150° 0.0° 180° 0.0° 210° 1.0°E 240° 2.0°E 270° 1.5°E 300° 1.0°E 330° 0.0° You are turning for 7.5 knots. 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°pgc. What is the gyro error?Not learned 62. At 0720, you are in the outer channel between buoy "1" and buoy "2" and change course to pass Townshend Ledge Lighted Bell Buoy "10A" abeam to port at 200 yards. What is your ETA off the buoy?Not learned 63. At 0740, you obtain the following radar information: Branford Reef Light bearing 070° true at 2.55 nm What is your position?Not learned 64. From your 0740 position, you change course to pass 1.1 miles north of Falkner Island Light. Which of the following is true?Not learned 65. At 0802, Branford Reef Light bears 348°T at 0.75 mile, and the north point of Falkner Island bears 088°T at 6.7 miles. What were the set and drift since 0740?Not learned 66. What publication contains information on the navigational hazards in the vicinity of Falkner Island?Not learned 67. If there is no current, what is the course per standard magnetic compass from your 0802 fix to the position 1.1 miles north of Falkner Island Light?Not learned 68. At 0830, you wish to get the latest weather forecasts for the Falkner Island area. On what frequency would you set your FM radio for this information?Not learned 69. At 0844, the range to the north end of Falkner Island is 2.0 miles and the left tangent bearing is 102°T. What is the approximate charted depth of the water?Not learned 70. At 0925, you obtain the following radar information: Falkner Island Light bearing 252° true at 1.65 nm If you correct for a current setting 215°T at 0.5 knot, what course will you steer from the 0925 position to arrive at a position 0.5 mile south of Long Sand Shoal West End Horn Buoy "W"?Not learned 71. If you correct for the current in the preceding question (215°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"?Not learned 72. At what approximate distance would you expect Bartlett Reef Light to break the horizon, if the visibility is 27 nautical miles?Not learned 73. Long Sand Shoal __________.Not learned 74. At 1200, your position is 2.0 miles southwest of Bartlett Reef Light. Your heading is 075°T. Visibility is less than 0.2 mile in fog and rain. Which of the following signals is most likely to be from another vessel?Not learned 75. What chart should you use after you enter New London Harbor?Not learned 76. The following questions should be answered using Chart 12354TR, Long Island Sound - Eastern Part, and the supporting publications. Your vessel has a draft of 12 feet (3.7 meters) Your height of eye is 24 feet (7.3 meters) Variation is 14°W "Per standard magnetic compass" is abbreviated "psc" “Per gyrocompass” is abbreviated “pgc” DEVIATION TABLE Magnetic Heading Deviation 000° 0° 030° 1°W 060° 2°W 090° 4°W 120° 2°W 150° 1°W 180° 1°E 210° 2°E 240° 3°E 270° 3°E 300° 2°E 330° 1°E Your position is LAT 40°59.0'N, LONG 73°06.2'W. What is the course psc to New Haven Harbor Lighted Whistle Buoy "NH"?Not learned 77. You depart from the position in the previous question at 2114 and make good 12 knots on a course of 040°T. At what time will you sight New Haven Light if the visibility is 11 miles?Not learned 78. At 2142, you take the following bearings: Stratford Point Light: 331°T Stratford Shoal Middle Ground Light: 280°T Old Field Point Light: 223°T What is your 2142 position?Not learned 79. What was the speed made good between 2114 and 2142?Not learned 80. At 2142, you change course to make good 030°T and increase speed to 14 knots. You rendezvous with another vessel and receive fresh supplies while off New Haven Harbor lighted whistle buoy "NH". What is the light characteristic of this buoy?Not learned 81. At 0109 you get underway, and at 0112 you take the following bearings: Branford Reef Light: 051° t rue Stratford Point Light: 258° t What is your 0112 position?Not learned 82. At 0112, what is the approximate depth under the keel?Not learned 83. At 0112, you are on course 124°T and turning for 12.0 knots. What course will you make good if the current is 255°T at 1.2 knots?Not learned 84. Branford Reef is __________.Not learned 85. 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?Not learned 86. At 0130, your position is LAT 41°09.3'N, LONG 72°46.9'W when you change course to 086°T. If you make good 086°T, what is the closest point of approach to Twenty-Eight Foot Shoal Lighted Buoy?Not learned 87. At 0200, you take the following bearings: Falkner Island Light 004.5°T Kelsey Pt. Breakwater Lt. 054.0°T Horton Point Light 115.0°T What were the set and drift from 0130?Not learned 88. What is the distance from your 0200 position to the point where Twenty-Eight Foot Shoal lighted buoy is abeam to starboard?Not learned 89. The shoreline along Rocky Point should give a good radar return because __________.Not learned 90. You sight Bartlett Reef Light in line with New London Harbor Light bearing 043°pgc. You are heading 088°pgc and 098.5° per standard magnetic compass at the time of the observation. Which statement is TRUE?Not learned 91. The following questions are based on Chart 13205TR, Block Island Sound, and the supporting publications. Your draft is 18 feet (5.5 meters) Your height of eye is 20 feet (6.1 meters) Gyro error is 3°W Variation is 15°W "Per standard magnetic compass" is abbreviated "psc" “Per gyrocompass” is abbreviated “pgc” DEVIATION TABLE Magnetic Heading Deviation 000° 1.5°E 030° 2.5°W 060° 2.5°W 090° 2.0°W 120° 1.0°W 150° 0.5°W 180° 0.0° 210° 1.0°E 240° 1.5°E 270° 2.0°E 300° 1.0°E 330° 0.5°W At 0630, Buoy "PI" is 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 210°pgc and Race Rock Light is bearing 075°pgc. What is your 0654 position?Not learned 92. What was the course made good from 0630 to 0654?Not learned 93. What course should you steer by the standard magnetic compass in order to maintain a heading of 081°pgc?Not learned 94. At 0705, 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?Not learned 95. At 0728, Race Rock Light is bearing 282°T at 3.8 miles, and the closest point on Fishers Island has a radar range of 2.1 miles. What speed have you been making since you changed course at 0705?Not learned 96. At 0727, the cupola on Fishers Island is in line with Latimer Reef Light bearing 024°pgc. Based on this information what is the gyro error?Not learned 97. At 0748, you take the following bearings: Watch Hill Point Light 026.5°pgc Race Rock Light 275.5°pgc What is the approximate depth of water under the keel at this position?Not learned 98. At 0748, you change course to 160°T, speed 10 knots. At what time will you cross the 120-foot curve the first time?Not learned 99. At 0815, Montauk Pt. Light House is bearing 172°T, Shagwong Pt. has a radar range of 4.5 miles. If the engine was making turns for 10 knots, what was the current since 0748?Not learned 100. Which action should you take to compensate for the above current?Not learned 101. At 0815, visibility is excellent and you can see Montauk Point. Montauk Point Light is __________.Not learned 102. At 0815, you change course to 079°T. To compensate for a southerly wind, you estimate a 3° leeway is necessary. Which course should you steer per standard magnetic compass to make good 079°T?Not learned 103. At 0839, Montauk Pt. Light is bearing 205°T at a radar distance of 6.6 miles. What is your speed made good from your 0815 position?Not learned 104. The area between Block Island and Montauk Point is bounded by dashed magenta lines. What does this represent?Not learned 105. Which chart should you use to enter Great Salt Pond?Not learned 106. The following questions are based on Chart 13205TR, Block Island Sound, and the supporting publications. Your draft is 18 feet (5.5 meters) Your height of eye is 20 feet (6.1 meters) Gyro error is 3°W Variation is 15°W "Per standard magnetic compass" is abbreviated "psc" “Per gyrocompass” is abbreviated “pgc” DEVIATION TABLE Magnetic Heading Deviation 000° 1.5°E 030° 2.5°W 060° 2.5°W 090° 2.0°W 120° 1.0°W 150° 0.5°W 180° 0.0° 210° 1.0°E 240° 1.5°E 270° 2.0°E 300° 1.0°E 330° 0.5°W At 0630, Buoy "PI" is 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 210°pgc and Race Rock Light is bearing 075°pgc. What is your 0654 position?Not learned 107. What was the course made good from 0630 to 0654?Not learned 108. What course should you steer by the standard magnetic compass in order to maintain a heading of 081°pgc?Not learned 109. At 0705, 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?Not learned 110. At 0728, Race Rock Light is bearing 282°T at 3.8 miles, and the closest point on Fishers Island has a radar range of 2.1 miles. What speed have you been making since you changed course at 0705?Not learned 111. At 0727, the cupola on Fishers Island is in line with Latimer Reef Light bearing 024°pgc. Based on this information what is the gyro error?Not learned 112. At 0748, you take the following bearings: Watch Hill Point Light 026.5°pgc Race Rock Light 275.5°pgc What is the approximate depth of water under the keel at this position?Not learned 113. At 0748, you change course to 160°T, speed 10 knots. At what time will you cross the 120-foot curve the first time?Not learned 114. At 0815, Montauk Pt. Light House is bearing 172°T, Shagwong Pt. has a radar range of 4.5 miles. If the engine was making turns for 10 knots, what was the current since 0748?Not learned 115. Which action should you take to compensate for the above current?Not learned 116. At 0815, visibility is excellent and you can see Montauk Point. Montauk Point Light is __________.Not learned 117. At 0815, you change course to 079°T. To compensate for a southerly wind, you estimate a 3° leeway is necessary. Which course should you steer per standard magnetic compass to make good 079°T?Not learned 118. At 0839, Montauk Pt. Light is bearing 205°T at a radar distance of 6.6 miles. What is your speed made good from your 0815 position?Not learned 119. The area between Block Island and Montauk Point is bounded by dashed magenta lines. What does this represent?Not learned 120. Which chart should you use to enter Great Salt Pond?Not learned