Your vessel is on a course of 237°T at 18 knots. At 0404 a light bears 263.5°T, and at 0430 the light bears 282°T. At what time and at what distance off will your vessel be when abeam of the light?

Correct Answer: Option B — 0456, 7.8 miles

Applying Bowditch's principles for two bearings and run between them, the distance off when abeam is calculated using relative motion factors. Time elapsed between bearings multiplied by vessel speed determines the run. Standard piloting equations yield the 0456 ETA and 7.8 mile abeam distance.