Your vessel is on course 093°T at 15 knots. At 1835 a light bears 136°T, and at 1857 the same light bears 170°T. What was your distance off the light at 1857?

Correct Answer: Option C — 6.8 miles

Calculate distance off abeam using the running fix time interval (1835 to 1857 = 22 minutes) at 15 knots. Applying the difference in bearings from the light (136°T to 170°T) determines the vessel's distance off at the second bearing to be 6.8 miles.