You are on course 138°T. To check the latitude of your vessel you should observe a celestial body on which bearing?

Correct Answer: Option A — 000°

According to Bowditch, celestial observations taken on the prime vertical (bearings 090° or 270°) provide the most accurate longitude determination. Conversely, bodies observed on the meridian (bearings 000° or 180°) lie directly in the direction of the observer's latitude line, making them ideal for checking latitude.