On 18 August at 0600 ZT, morning stars were observed, and the vessel's position was determined to be LAT 19°48'N, LONG 108° 34'W. Your vessel is steaming on course 166°T at a speed of 16 knots. An observation of the Sun's lower limb is made at 1036 ZT. The chronometer reads 05h 34m 48s and is slow 01m 24s. What is the computed altitude (Hc) and azimuth (Zn) for this 1036 ZT observation using the assumed position method?

Question

On 18 August at 0600 ZT, morning stars were observed, and the vessel's position was determined to be LAT 19&deg;48'N, LONG 108&deg; 34'W. Your vessel is steaming on course 166&deg;T at a speed of 16 knots. An observation of the Sun's lower limb is made at 1036 ZT. The chronometer reads 05h 34m 48s and is slow 01m 24s. What is the computed altitude (Hc) and azimuth (Zn) for this 1036 ZT observation using the assumed position method?

Accepted Answer

Option B: Hc 65&deg;14.8', Zn 100.4&deg;. Using Greenwich Mean Time derived from chronometer time and error, entering the Nautical Almanac for GHA and declination, and applying the assumed position method per Bowditch formulas yields Hc 65°14.8' and Zn 100.4°.