You are steering 246°T, and a light is picked up dead ahead at a distance of 14 miles at 1037. You change course to pass the light 2.5 miles off abeam to port. If you are making 12 knots, what is your ETA at the position 2.5 miles off the light?

Correct Answer: Option D — 1146

Using right-triangle trigonometry from Bowditch, when altering course from a head-on light to pass at a specified abeam distance, the new run is the hypotenuse calculation using the offset. The track distance divided by 12 knots gives the elapsed time, establishing an ETA of 1146.