On 22 February your 0800 zone time position is LAT 24°16'S, LONG 95°37'E. Your vessel is on course 126°T at a speed of 14 knots. An observation of the Sun's lower limb is made at 0945 zone time. The chronometer reads 03h 47m 22s, and the chronometer error is 02m 37s fast. The observed altitude (Ho) is 57°02.1'. LAN occurs at 1148 zone time, and a meridian altitude of the Sun's lower limb is made. The observed meridian altitude (Ho) is 75°22.3'. Determine the vessel's 1200 zone time position.

Question

On 22 February your 0800 zone time position is LAT 24&deg;16'S, LONG 95&deg;37'E. Your vessel is on course 126&deg;T at a speed of 14 knots. An observation of the Sun's lower limb is made at 0945 zone time. The chronometer reads 03h 47m 22s, and the chronometer error is 02m 37s fast. The observed altitude (Ho) is 57&deg;02.1'. LAN occurs at 1148 zone time, and a meridian altitude of the Sun's lower limb is made. The observed meridian altitude (Ho) is 75&deg;22.3'. Determine the vessel's 1200 zone time position.

Accepted Answer

Option C: LAT 24&deg;52.2'S, LONG 96&deg;24.0'E. Calculate the sun line of position using the intercept method and advance it to 1200 ZT. Combine this with the meridian altitude at LAN to establish the running fix. The intersection of the advanced LOP and the latitude at LAN provides the 1200 ZT position of 24°52.2'S, 96°24.0'E.