Your vessel is on a course of 221°T at 15 knots. At 0319 a light bears 198.5°T, and at 0353 the light bears 176°T. At what time and at what distance off will your vessel be when abeam of the light?

Correct Answer: Option D — 0417, 6.0 miles

Applying the six-minute rule and relative bearing calculations determines time and distance off when abeam. The run distance divided by the change in sine or cosine factors yields precise off-track distances and intercept times.