Chris Gray.
AMPLITUDE
1. On 3rd July in position 54º58'N 31º50'W the Sun set bearing 310ºC.
Find the compass error and the deviation if the variation is 2ºE.
2. On 21st August in DR 60º10'N 04º30'E, the Sun rose bearing 080ºC.
Find the compass error and the deviation if the variation is 9.5ºW.
3. On 24th May at sunset the chronometer read 12:07:19, in DR position
43º16'S 91º14'E. Find the amplitude.
4. On 23rd May in position 21º14S 169º56'W the sun set bearing 294ºG.
Find the gyro error.
5. On 6th March in position 48º12N 154º10E Vega was observed setting on a
bearing of 337ºG. Find the gyro error.
6. Should you take amplitude observations of the Moon and if not why not?
ANSWERS
1. 2.7ºE 0.7ºE
2. 14.9ºW 5.4ºW
3. 299.25º
4. 1.6ºH
5. 2.9ºL
Glasgow College of Nautical Studies Faculty of Maritime Studies
AZIMUTHS
1. 16th September in DR 42º40'N 46º20'W, at 11h 40m 15s(Z), the sun bore 143ºC. Find the true bearing and deviation if the variation is 24ºW.
2. On the morning of 24th June in DR 38º00'S 124º05'E, when the chronometer
showed 11:55:00., the sun bore 054ºC. Find the deviation if the variation was 2ºW.
3. On the 5 January in DR 46º02'N 47º52'W, when the chronometer showed
01:41:28., the star Schedar bore 338ºC. Find the deviation if the
variation was 28ºW.
4. Just after midnight on the 6 March in DR 26º30'S 170º28'E, when the
chronometer showed 01:21:06., the star Arcturus bore 048ºC.
Find the deviation if the variation was 14ºE.
5. On the 5 March in DR 45º19'S 130º16'W, at 21:07:16 Zone time, the
star Spica bore 093ºC. Find the true bearing & the compass error.
6. On the morning of 25 November in DR 33º46'N 162º19'E, when the
chronometer showed 09:21:12., the sun bore 133ºC. Find the true bearing
and deviation if the variation was 2ºW.
1. 117.5ºT, 1.5ºW
2. 0.5ºW
3. 0.7ºE
4. 18.2ºW
5. 088ºT, 5ºW
6. 128ºT,
JMcE;H:\OLDFILES\NAVIG8\AMPLAZIM 1/2
dariusz.lipinski