You are steering 078°T, and a light is picked up dead ahead at a distance of 15.6 miles at 2316. You change course to pass the light 4.5 miles off abeam to port. If you are making 17 knots, what is your ETA at the position 4.5 miles off the light?

Correct Answer: Option A — 0009

Applying Bowditch piloting geometry for course alterations toward an off-center abeam passage, the distance made good along the original bearing and the offset distance form a right triangle. Dividing this track distance by 17 knots yields the run time, resulting in an ETA of 0009.