Exercise 12

1. On 6^th March 1992, AM at ship in DR 24⁰ 12’S 83⁰ 46’E, the azimuth of the star ALTAIR was 078⁰(C) at 10h 38m 40s chron time. If chron error was 03m 24s fast and variation was 3⁰W, find the deviation for the ship’s head.

Solution-

2. On 30^th Nov 1992, PM at ship in DR 48⁰ 57’N 173⁰ 18’W, the azimuth of the star VEGA was 296⁰(C) at 07h 27m 12s chron time. If chron error was 12m 10s slow and variation was 3⁰W, calculate the deviation of the compass.

Solution-

3. 1^st May 1992, AM at ship in DR 62⁰ 11’S 179⁰ 58’E, the azimuth of the star SPICA was 312⁰(C) at 01h 03m 16s chron time (error 03m 08s fast). If variation was 10⁰E, find the deviation for the ship’s head.

Solution-

4. On 13^th Sept 1992, in DR 30⁰ 46’N 90⁰ 36’W, the star RASALHAGUE bore 275⁰(C) at 04h 36m GMT. If variation was 5⁰W, find the deviation of the compass.

(Caution: Date given is ship’s date not GMT date).

Solution 

5. On 21^st Jan 1992, at 032⁰ ship’s time, in DR 64⁰ 12’N 112⁰ 18’E the star DENEB bore 034.5⁰(C). If variation was 4⁰E, and ship’s time was 7h ahead of GMT, find the deviation.

Solution –