Pre-Voyage Procedures, Principles of Celestial Navigation, Terrestrial Navigation, Flashcards
A ship steaming on a course of 246˚ T at 17 knots. At 2107 a lighthouse was observed bearing 207 deg T and at 2119 the same lighthouse bears 179˚ T. What is the ship’s distance off at second bearing?
4.6 miles
A ship is steaming a course of 090˚ T at a speed of 14 knots. At 1841H you observed a lighthouse bearing 053 deg.T and at 1904H, the same lighthouse bears 031˚ T. What is the distance to the lighthouse when abeam?
7.4 miles
Aship is steaming a course of 090˚T at a speed of 14 knots. At 1841, you observed a lighthouse bearing 053°T and at 1904, the same lighthouse bears 031˚T. What will be the time when the lighthouse is abeam of your vessel?
1923
You are steaming on course 090˚T at 14 knots when a lighthouse was observed bearing 053˚ T at 1841. The same lighthouse bears 031˚T at 1904. What is the distance off the lighthouse at second bearing?
8.6 miles
A ship is on course 253˚ T at 14 knots. At 2329 a lighthouse was observed bearing 282˚ T At 2345 the same lighthouse bears 300 deg.T Find the ship’s distance off at second bearing?
5.9 miles
You are steering 078˚ T, and a light was seen dead ahead at a distance of 15.6 miles at 2316 you change course to pass the light abeam to port at a distance of 4.5 miles. If you are making 17 knots, what is the time when abeam of the light?
0009H
You are steering 031˚ T, and a light was seen dead ahead at a distance of 12.7 miles at 0017H you change course to pass the light abeam to starboard at a distance of 3.5 miles. If you are making 11 knots, what is the time when abeam of the light?
0124H
You are steering 173˚T and a light was picked up dead ahead at a distance of 13.9 miles at 0054. You change course to pass the light 4.5 miles off abeam to port. If you making 21 knots, what will be the time when abeam of the light?
0131H
You are steering 163˚ T and a light was picked up dead ahead at a distance of 11 miles at 0142. You change course to pass the light 2 miles off abeam to starboard. If you making 13 knots, what will be the time when abeam of the light?
0232H
A vessel was steaming on a course 168˚ T at a speed of 18 knots. At 1426H a buoy was sighted bearing 144˚ T . At 1434 another bearing of the buoy was taken at 116˚ T. What is the distance off the second bearing and the predicted distance when abeam?
2.0 miles,2nd bearing; 1.8 miles abeam
You desire to make good a true course of 067˚T.The variation is 11˚ West, the magnetic compass deviation is 3˚ East and the gyro error is 1˚ West. A northwesterly wind produces a 5 degree leeway. What should be the course to steer per standard compass to make good the true course?
070 psc
You desire to make good a true course of 129˚T. The variation is 7˚ East, magnetic compass deviation is 4˚ East and the gyro error is 2˚ West. An easterly wind produces a 4 degree leeway. What should be the course to steer per magnetic compass in order to make good the true course?
114 psc
The True course between two points is 023˚T The gyro error is 1˚West and you make an allowance of 4 degree leeway for an East wind. What gyro course should be steered in order to make the True course good?
026 pgc
The True course between two points is 041˚T. The gyro has an error of 1˚ West. You make an allowance of 2 degree leeway for an east-southeast wind. What gyro course should be steered to make the True course good?
044 pgc
Your vessel is steering a course of 027˚ psc. The variation for the locality is 19˚ West and the deviation of the compass is 2˚ East. The wind is from the North-northwest, producing a 5 degree Leeway. What True course are you making good?
015 T
A ship was on course 253˚ T at 14 knots. At 2329 a lighthouse was observed bearing 282˚ T At 2345, the lighthouse bears 300˚ T. What is the ship’s distance off the second bearing and distance when abeam?
5.9 mi./ 4.3 mi.
You are steering 019˚T, and a light was picked up dead ahead at a distance of 11.6 miles at 0216H. You change course to pass the light 3 miles off abeam to port. If you are making 14 knots, what is your ETA at the position 3 miles off the light?
0304H
You are steering 231˚ T, and a light is picked up dead ahead at a distance of 12.3 miles at 0338H. You then change course to pass the light 4 miles off abeam to starboard. If you are making 16.5 knots, what is your ETA at the position 4 miles off the light?
0420H
You are steering 287˚T and a light was picked up dead ahead at a distance of 19.4 miles at 0419H. You change course to pass the light 4 miles off abeam to starboard. If you are making 13 knots, what is your ETA at the position 4 miles off the light?
0547H
You are steering 115˚ T, and a light was picked up dead ahead at a distance of 16.7 miles at 0522. You change course to pass the light 3.5 miles off abeam to port. If you are making 12 knots, what is your ETA at the position 3.5 miles off the light?
0644H
Your ship is sailing at 20 knots on course 160˚T. At 1840 hours you observe a lighthouse bearing 205˚ T. At 1908 hours, the light bears 250˚ T. What is your distance off the lighthouse at the second bearing?
9.3 miles
Your ship is sailing on course 250˚ T at 20 knots. At 1418 hours you observe a lighthouse bearing 205˚T At 1446 hours, the same lighthouse bears 160˚ T. At what distance off will your vessel be abeam of the light?
9.3 miles
Your vessel is on course of 343˚T at 14 knots. At 2156H a light bears 320.5˚T and at 2217H the same light bears 298˚T. At what time and at what distance off will your vessel be abeam of the light?
2232H, 3.4 miles
Your vessel is proceeding down 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 229˚T and the variation is 6˚ West. If the heading of your vessel at the time of the sighting is 232˚ psc, what is the correct deviation?
3 deg. East