Q330 - 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 draws 11 feet (3.3 meters) Your height of eye is 24 feet (7.3 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 030° 1.5°E 060° 3.0°E 090° 2.5°E 120° 2.0°E 150° 1.0°W 180° 3.0°W 210° 1.0°W 240° 0.0° 270° 0.0° 300° 1.0°E 330° 1.0°E 360° 1.5°E At 0410, you take the following bearings: New Point Comfort Spit Light "2": 244°pgc Wolf Trap Light: 315°pgc What is your 0410 position?Not learned 2. If the visibility is 10 miles and you are in the red sector, at what distance off should you sight Cape Henry Light?Not learned 3. From your 0410 fix, what is the course per standard magnetic compass to enter York Spit Channel with buoy "29" close abeam to starboard?Not learned 4. If you are making 8.3 knots over the ground, what is your ETA at the turning point in York Spit Channel at buoy "29"?Not learned 5. You are entering the channel at buoy 29 and turning for 9 knots. An easterly 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 middle leg of York Spit Channel?Not learned 6. Which publication contains specific information on the characteristics of Chesapeake Bay entrance?Not learned 7. The Coast Guard announces that Chesapeake Channel is closed indefinitely due to a collision in the channel between Trestle "B" and "C" of the Chesapeake Bay Bridge and Tunnel. You exit York Spit Channel, leaving buoy "22" close abeam to port at 0.1 mile, and alter course to leave Horseshoe Crossing Lighted Bell Buoy "HC" abeam to port at 0.2 mile. What is the course per gyrocompass?Not learned 8. After you enter Thimble Shoal Channel, you will alter course to pass between Trestle "A" and "B". Based upon your present position, passing buoy "12" to port, what is TRUE?Not learned 9. As you pass through the Chesapeake Bay Bridge and Tunnel, you sight Trestle "B" in line bearing 018°pgc. What is the gyro error by observation?Not learned 10. You sighted Trestle "B" in line at 0706 and are steering 108°T. At 0731, Cape Henry Light bears 136°T Cape Charles Light bears 032.5°T Thimble Shoal Tunnel South Light bears 282°T What was the speed made good between 0706 and 0731?Not learned 11. At 0731, what is the approximate depth of water?Not learned 12. What is the coastwise distance from your 0731 fix to Wilmington, DE (LAT 39°43.2'N, LONG 75°31.5'W)?Not learned 13. When will you enter waters governed by the International Rules of the Road?Not learned 14. At 0812 you obtain the following information: Chesapeake Light bears 091° T at a range of 10.5 nm What is your 0812 position?Not learned 15. At 0812, you are on course 132°T. The standard magnetic compass reads 135°. What should you conclude?Not learned 16. 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 17. Which of the following describes the coast between Great Machipongo Inlet and Cape Charles?Not learned 18. 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 19. What is the course to steer per gyrocompass from the anchorage to point "A" if easterly winds are causing 3° of leeway?Not learned 20. 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 21. 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 22. The visibility is about 5 miles. Which statement about Cape Charles Light is TRUE?Not learned 23. Which statement about your 0400 position is TRUE?Not learned 24. 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 25. 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 26. Which of the following is a characteristic of the abandoned lighthouse at Cape Henry?Not learned 27. Weather broadcasts for the Norfolk area are broadcast on which frequency?Not learned 28. \When Cape Henry Light is abeam, what is the approximate distance to Yorktown?Not learned 29. 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 30. 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 31. The following questions should be answered using Chart 12354TR, Long Island Sound - Eastern Part, and the supporting publications. Your draft is 12 feet (3.6 meters) Your height of eye is 25 feet (7.6 meters) Gyro error is 2° W Variation is 14° W "Per standard magnetic compass" is abbreviated "psc" "Per gyrocompass" is abbreviated "pgc" DEVIATION TABLE Magnetic Heading Deviation 000° 0° 030° 1.0° 060° 3.0° 090° 2.0° 120° 1.0° 150° 0° 180° 0° 210° 1.0° 240° 2.0° 270° 1.5° 300° 1.0° 330° 0° Your speed is 7.5 knots. You are in New Haven Outer Channel and sight the range markers in line directly over the stern. Your heading at the time is 168° psc. What is the magnetic compass error?Not learned 32. 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 0.1 miles. What is the course to steer per gyrocompass if a northerly wind causes 2° of leeway?Not learned 33. At 0740, you obtain the following radar data: Branford Reef Light bears 068°T at 3.0 nm What is your position?Not learned 34. 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 35. At 0802, the radar range and bearing to Branford Reef Light are 350°pgc at 0.8 mile, and the north point of Falkner Island are 090°pgc at 6.7 miles. What were the set and drift that you encountered since 0740?Not learned 36. Falkner Island Light is shown __________.Not learned 37. 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 38. At 0830, you want the latest weather forecasts for the Falkner Island area. On what frequency do you set your FM radio for this information?Not learned 39. At 0844, the range to the north end of Falkner Island is 2.0 miles and the left tangent bearing is 102°T. If the height of the tide is +1.0 foot, what is the approximate depth of the water under the keel?Not learned 40. At 0925, you plot the following: Falkner Island Light bearing 252°T at 1.8 nm If you correct for a current setting 035°T at 0.5 knot, what true 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 41. 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 42. At 0946, the radar range to Hammonasset Point is 2.5 miles. The range to the eastern most point of Falkner Island is 3.3 miles, and the range to Horton Point is 10.1 miles. What is your position at 0946?Not learned 43. Long Sand Shoal __________.Not learned 44. During extreme low water, the soundings near Saybrook may require corrections up to __________.Not learned 45. As you enter New London Harbor, you are steering on the entrance range. The lights are in line over the bow as you are heading 352°pgc. What is the gyro error?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 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 47. 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 48. At 0740, you take the following Radar Ranges: Branford Reef Light at 2.5 nm New Haven Light at 3.9 nm What is your position?Not learned 49. From your 0740 position, you change course to pass 1.1 miles north of Falkner Island Light. A northerly wind is causing a 2° leeway. What gyro course should you steer in order to ensure that you will remain clear of the 18' shoal located 1 mile NW of Falkner Island Light?Not learned 50. 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 51. What publication contains information on the navigational hazards in the vicinity of Falkner Island?Not learned 52. 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 53. 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 54. 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 55. At 0925, you plot the following bearings and range: Falkner Island Light: 251°T at 1.7nm Kelsey Point BW Light: 075°T If you correct for a current setting: 215°T 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 56. If you correct for the current in the previous 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 57. At what approximate distance would you expect Bartlett Reef Light to break the horizon, if the visibility is 27 nautical miles?Not learned 58. At 1038, you are 0.4 mile south of Long Sand Shoal Buoy "8A" on course 090°T. If you continue on your present course to the approaches of New London which of the following is true?Not learned 59. 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 60. What chart should you use after you enter New London Harbor?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 take the following Radar Ranges: Branford Reef Light at 2.5 nm New Haven Light at 3.9 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. A northerly wind is causing a 2° leeway. What gyro course should you steer in order to ensure that you will remain clear of the 18' shoal located 1 mile NW of Falkner Island Light?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 plot the following bearings and range: Falkner Island Light: 251°T at 1.7nm Kelsey Point BW Light: 075°T If you correct for a current setting: 215°T 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 previous 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. At 1038, you are 0.4 mile south of Long Sand Shoal Buoy "8A" on course 090°T. If you continue on your present course to the approaches of New London which of the following is true?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 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 77. 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 78. At 0740, you take the following Radar Ranges: Branford Reef Light at 2.5 nm New Haven Light at 3.9 nm What is your position?Not learned 79. From your 0740 position, you change course to pass 1.1 miles north of Falkner Island Light. A northerly wind is causing a 2° leeway. What gyro course should you steer in order to ensure that you will remain clear of the 18' shoal located 1 mile NW of Falkner Island Light?Not learned 80. 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 81. What publication contains information on the navigational hazards in the vicinity of Falkner Island?Not learned 82. 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 83. 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 84. 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 85. At 0925, you plot the following bearings and range: Falkner Island Light: 251°T at 1.7nm Kelsey Point BW Light: 075°T If you correct for a current setting: 215°T 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 86. If you correct for the current in the previous 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 87. At what approximate distance would you expect Bartlett Reef Light to break the horizon, if the visibility is 27 nautical miles?Not learned 88. At 1038, you are 0.4 mile south of Long Sand Shoal Buoy "8A" on course 090°T. If you continue on your present course to the approaches of New London which of the following is true?Not learned 89. 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 90. What chart should you use after you enter New London Harbor?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