129. On 15 July in DR position LAT 22°19.0'N, LONG 154°37.0'W, you observe an amplitude of the Sun. The Sun's center is on the visible horizon and bears 298°psc. The chronometer reads 04h 45m 19s and is 01m 56s slow. Variation in the area is 7.5°W. What is the deviation of the standard magnetic compass?

The compass deviation is calculated by comparing the true amplitude, derived from latitude and declination, with the observed compass amplitude, accounting for variation. The difference between the true and compass amplitudes yields a compass error, which when combined with the variation, determines the deviation to be 3.0E.