National Maritime Center Providing Credentials to Mariners Q163 Navigation Problems-Chart 13205 TR (Sample Examination) Page 1 of 5
Choose the best answer to the following Multiple Choice Questions. Each question is completely independent of any other question on this exam. The following information is applicable to all questions. The following questions should be answered using chart 13205 TR, Block Island Sound, and the supporting publications. "Per standard magnetic compass" is abbreviated "psc" Per gyrocompass is abbreviated pgc Variation is 15 W DEVIATION TABLE Magnetic Heading Deviation 000 2.0 E 030 3.0 E 060 4.0 E 090 2.0 E 120 1.0 E 150 1.0 W 180 2.0 W 210 3.5 W 240 3.0 W 270 1.5 W 300 0.0 330 1.5 E 1. 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 8.7 knots, the current is 130 at 1.2 knots, and a northerly wind causes 3 of leeway? (A) 102 T o (B) 108 T o (C) 112 T o (D) 105 T Page 2 of 5
2. Sounding contours in unshaded water areas are at what interval? o (A) 10 foot up to 100 ft depths then at 30 foot intervals o (B) 10 fathom intervals o (C) The interval will vary to ensure any major underwater hazard is highlighted. (D) 30 foot intervals 3. You are on course 137 per standard magnetic compass when you take the following bearings: Watch Hill Point Light - 051 psc Montauk Point Light - 184 psc Race Rock Light - 279 psc What is your position? o (A) LAT 41 15.1'N, LONG 71 54.9'W o (B) LAT 41 15.1'N, LONG 71 53.8'W o (C) LAT 41 15.0'N, LONG 71 53.7'W (D) LAT 41 15.2'N, LONG 71 54.4'W 4. At 1016 your position is LAT 41 07.6'N, LONG 71 38.5'W. At 1116 your position is LAT 41 01.4'N, LONG 71 29.4'W. What was the course made good between the two positions? o (A) 135 T o (B) 143 T o (C) 140 T (D) 132 T 5. When approaching Block Island Sound from Long Island Sound, you will enter waters governed by the International Rules of the Road when you. (A) pass through The Race o (B) cross the territorial sea boundary o (C) exit Block Island Sound to the east or south o (D) None of the above, as Long Island Sound is governed by the International Rules of the Road Page 3 of 5
6. What is the time of the first PM (Daylight Savings Time) maximum ebb current at Plum Gut on 10 August 1983? (A) 1445 o (B) 1249 o (C) 1340 o (D) 1231 7. At 2038 your position is LAT 41 09.2'N, LONG 71 40.6'W. You are on course 301 per standard magnetic compass at 7.2 knots. At 2152 your position is LAT 41 11.3'N, LONG 71 48.6'W. What were the set and drift? (A) 096 T at 2.0 knots o (B) 261 T at 1.2 knots o (C) 277 T at 0.9 knot o (D) 080 T at 1.0 knot 8. At 0242 your position is LAT 41 16.8'N, LONG 71 39.9'W. You are turning for 9.3 knots. What is your ETA at the West Gap of Pt. Judith Harbor of Refuge? (A) 0336 o (B) 0325 o (C) 0329 o (D) 0319 9. You are on course 302 per standard magnetic compass when you sight Block Island Southeast Point Light in line with the Block Island Aero Beacon bearing 323 per standard magnetic compass. Based on this information which of the following should you do? o (A) know the deviation is 15 E o (B) swing your vessel to check the deviation table o (C) know the deviation is equal to the variation (D) know the deviation table is correct for that heading Page 4 of 5
10. Determine the course per standard magnetic compass from the entrance to Ninigret Pond (LAT 41 21.3'N, LONG 71 38.3'W) to the entrance to Great Salt Pond on Block Island. (A) 184.0 psc o (B) 192.0 psc o (C) 154.5 psc o (D) 152.5 psc Page 5 of 5