EXERCISE-16

 

1. On the morning of 1^st Dec 1992, in DR 47⁰ 16’N 143⁰ 26’E, the sextant altitude of the Polestar was 46⁰7’ at 08h 51m 15s chron time (error 05m 11s slow). If IE was 2.1’ off the arc and HE was 17m, find the direction of the PL and a position through which it passes.

Solution –

2. In the evening of 22^nd Sept 1992, a ship in DR long 160⁰ 12’W, found the sextant altitude of Polaris to be 36⁰6’ at 05h 23m 17s chron time (error 02m 09s fast). If IE was 2.8’ on the arc and HE was 10m, find the direction of the PL and the latitude where it cuts the DR longitude.

Solution –

3. At about 0330 ship’s time on 1^st May 1992, in DR longitude 150⁰E, the observed altitude of Polaris was 50⁰ 8’ bearing 005⁰ (C) at 05h 30m 30s by chron (error nil). HE 14m var 1⁰E. Find the deviation of the compass, the direction of the PL and a position through which to draw it.

Solution –

4. On 6^th March 1992, at 0200 ship’s time in DR 37’N 00⁰ 00’, the Pole star bore 365⁰ (C). If variation was 3.7⁰W, find the deviation of the compass.

Solution –

5. On 13^th Sept 1992, PM at ship in DR 37⁰ 26’N 72⁰ 46’E, the Pole star bore 350⁰ (C) at 03h 59m 03s by chron (error 10m 03s slow). If variation was 10⁰E, find the deviation for the ship’s head.

Solution –