You are steaming on a course of 215°T at 14 knots. At 1841 you observe a lighthouse bearing 178°T. At 1904 the same lighthouse bears 156°T. What is your distance off at the second bearing?

Correct Answer: Option B — 8.7 miles

In accordance with Bowditch chart work principles, the time interval and vessel speed determine the run vector, which combined with measured angles yields a second-bearing distance off of 8.7 miles.