Your vessel is underway on a course of 323.5°T at a speed of 16 knots. At 1945 a light bears 350°T. At 2010 the light bears 008.5°T. What will be your distance off when abeam of the light?

Correct Answer: Option A — 6.7 miles

The distance off when abeam is found using the 'doubling the angle on the bow' or the 'bow and beam' bearing method. With a 25-minute interval and the change in relative bearing, the distance off when the light is abeam is calculated as 6.7 miles.