146. On 16 April in DR position LAT 28° 07.0' N, LONG 81° 47.0' W, you observe an amplitude of the Sun. The Sun's center is on the visible horizon and bears 073.5° psc. The chronometer reads 10h 53m 41s and is 02m 23s slow. Variation in the area is 11° E. What is the deviation of the magnetic compass?

The magnetic compass deviation is calculated using the sun's true amplitude, observed compass bearing, and variation. The true amplitude is determined from the latitude and declination, converted to a true bearing, and compared to the observed compass bearing to find the total compass error. Subtracting the variation from the total compass error yields a deviation of 6.5 West.