You are steaming on a course of 246°T at 17 knots. At 2107 you observe a lighthouse bearing 207°T. At 2119 the lighthouse bears 179°T. What is your distance off at the second bearing?

Correct Answer: Option D — 4.6 miles

Applying Bowditch's piloting principles for a running fix, the run distance between bearings and relative angles are computed using trigonometry to determine the exact distance off at the second observation as 4.6 miles.