On 17 April your 1610 ZT DR position is LAT 22°07.0'N, LONG 158°16.0'W. At that time, you observe the Sun bearing 271°psc. The chronometer reads 03h 08m 52s, and the chronometer error is 01m 16s slow. The variation is 4°E. What is the deviation of the standard magnetic compass?

Question

On 17 April your 1610 ZT DR position is LAT 22&deg;07.0'N, LONG 158&deg;16.0'W. At that time, you observe the Sun bearing 271&deg;psc. The chronometer reads 03h 08m 52s, and the chronometer error is 01m 16s slow. The variation is 4&deg;E. What is the deviation of the standard magnetic compass?

Accepted Answer

Option C: 2.3&deg;W. Calculate the Sun's True Azimuth (Zn) using celestial navigation procedures. Apply Variation (4°E) to the Zn to obtain the Magnetic Azimuth. The difference between the Magnetic Azimuth and the Compass Bearing (271°psc) results in a deviation of 2.3°W, following the Can Dead Men Vote Twice at Elections mnemonic.

On 17 April your 1610 ZT DR position is LAT 22&deg;07.0'N, LONG 158&deg;16.0'W. At that time, you observe the Sun bearing 271&deg;psc. The chronometer reads 03h 08m 52s, and the chronometer error is 01m 16s slow. The variation is 4&deg;E. What is the deviation of the standard magnetic compass?

On 17 April your 1610 ZT DR position is LAT 22°07.0'N, LONG 158°16.0'W. At that time, you observe the Sun bearing 271°psc. The chronometer reads 03h 08m 52s, and the chronometer error is 01m 16s slow. The variation is 4°E. What is the deviation of the standard magnetic compass?