On 06th March 2008, AM at ship in DR 24˚ 12’ S 083˚ 46’ E, the azimuth of the star ALTAIR was 078˚(C) when chron showed 10h 38m 40s. If the chron error was 03m 24s FAST and variation was 3˚W, find the deviation for the ship’s head.
GMT 05 March 22h 35m 16s
GHA Ȣ(05d 22h) 134˚ 01.0’ Dec N 08˚ 53.2’
Incr. (35m 16s) 008˚ 50.4’
GHAȢ 142˚ 51.4’
SHA * (+)062˚ 12.4’
GHA * 205˚ 03.8’
Long (E) (+)083˚ 46.0’
LHA * 288˚ 49.8’
NOTE:
Working is very similar to that of azimuth- Sun, except that GHA Ȣ and SHA * have been used, which can be taken from the nautical almanac.
P = (360˚ – LHA)
= (360˚ – 288˚ 49.8’)
= 71˚ 10.2’
We know that :
Azimuth = N 73.8˚ E
T Az = 073.8˚ (T)
C Az = 078.0˚ (C)
Error = 4.2˚ W
Variation = 3.0˚ W
Deviation = 1.2˚ W
On 30th Nov 2008, PM at ship in DR 48˚ 57’ N 173˚ 18’ W, the azimuth of the star VEGA was 296˚(C) when the GPS clock showed 07h 39m 22s. If variation was 1˚E, calculate the deviation of the compass.
d h m s
GMT 01 07 39 22
LIT (W) (-) 11 33 12
LMT 30 20 06 10
The direction of azimuth .. don’t you think should be N34.4W. it’s written east..in question no. 5 of azimuth star. Please let me know if it’s correct.
Good day Sir,
Just a short question, how do we name every deviation obtained from Azimuth Sun sailing? How do we know its east or west? Thank you
I found a very usefull.
Keep it up
Sir!!