At 1337 ZT on July 17, in DR position LAT 30° 56.8'S, LONG 039° 36.5'W, you observe an amplitude of the Moon. The upper limb of the moon is on the visible horizon, bearing 263.0°psc. The variation is 20°W. What is the deviation?

Question

At 1337 ZT on July 17, in DR position LAT 30&deg; 56.8'S, LONG 039&deg; 36.5'W, you observe an amplitude of the Moon. The upper limb of the moon is on the visible horizon, bearing 263.0&deg;psc. The variation is 20&deg;W. What is the deviation?

Accepted Answer

Option C: 3.6&deg;E. Determine the Moon's local coordinates and time of visible horizon crossing. Utilize the amplitude formula from Bowditch to compute true bearing from declination and latitude. Apply variation and compass error corrections to extract the correct standard compass deviation value.

At 1337 ZT on July 17, in DR position LAT 30&deg; 56.8'S, LONG 039&deg; 36.5'W, you observe an amplitude of the Moon. The upper limb of the moon is on the visible horizon, bearing 263.0&deg;psc. The variation is 20&deg;W. What is the deviation?

At 1337 ZT on July 17, in DR position LAT 30° 56.8'S, LONG 039° 36.5'W, you observe an amplitude of the Moon. The upper limb of the moon is on the visible horizon, bearing 263.0°psc. The variation is 20°W. What is the deviation?