On 15 August your 0512 zone time position was LAT 29°18.0'N, LONG 57°24.0'W. Your vessel was steaming on course 262°T at a speed of 20.0 knots. An observation of the Sun's lower limb was made at 0824 ZT. The chronometer read 00h 22m 24s and was slow 01m 34s. The observed altitude (Ho) was 38°16.7'. LAN occurred at 1204 zone time. The observed altitude (Ho) was 74°58.0'. What was the longitude of your 1204 zone time running fix?

Question

Accepted Answer

Option D: LONG 59°58.5'W. Using the meridian passage at 1204, the latitude is derived from the observed altitude. Advancing the 0512 position to 1204 using the vessel's speed and course, and applying the longitude correction, results in the final position of 59°58.5'W.