You are on course 317°T at 13 knots. A light is bearing 22.5° relative at 0640. At 0659 the same light is bearing 45° relative. At what time should the light be abeam?

Correct Answer: Option B — 0712

For a symmetrical relative bearing change from 22.5° to 45° on the bow, the time interval to the beam equals the time interval between observations (19 minutes). Adding 19 minutes to 0653 gives the exact time abeam at 0712.