On 17 January your 0730 zone time fix gives you a position of LAT 22°26.0'S, LONG 152°17.0'E. Your vessel is steaming on a course of 116°T at a speed of 17 knots. An observation of the Sun's lower limb is made at 1015 zone time. The chronometer reads 00h 13m 23s, and the chronometer error is 01m 49s slow. The observed altitude (Ho) is 66°02.1'. LAN occurs at 1152 zone time and a meridian altitude of the Sun's lower limb is made. The observed altitude (Ho) is 87°54.2'. Determine the vessel's 1200 zone time position.

Question

Accepted Answer

Option D: LAT 22°53.8'S, LONG 153°25.6'E. Advance the 1015 ZT sun line to 1200 ZT using the vessel's course and speed. Combine this with the meridian altitude observation at 1152 ZT to establish the latitude. The intersection of the advanced line and the meridian provides the final position of LAT 22°53.8'S, LONG 153°25.6'E.