On 7 May you observe Polaris for latitude at 0303 ZT. Your DR position is LAT 56°35.4' N, LONG 05°38.9' W. The sextant altitude is 56°11.1'. The height of eye is 36', and the index error is 3.3' off the arc. What is the latitude at the time of the sight?

Correct Answer: Option B — 56°38.7'N

Correct the sextant altitude for index error, dip, and refraction to obtain Ho. Use the Polaris correction tables in the Nautical Almanac, applying the LHA of Aries to the observed altitude. This yields the latitude, which is then adjusted for the specific DR position's local conditions.