You are steering a course of 316°T, and a light bears 34° on the port bow at 2053. At 2126 the same light bears 68° on the port bow, and you have run 5 miles since the first bearing. What is the ETA when the lighthouse is abeam?

Question

You are steering a course of 316&deg;T, and a light bears 34&deg; on the port bow at 2053. At 2126 the same light bears 68&deg; on the port bow, and you have run 5 miles since the first bearing. What is the ETA when the lighthouse is abeam?

Accepted Answer

Option D: 2139. Four-point bearing and special angle Bowditch piloting techniques establish that time between the second bearing and abeam equals time run between observations. Factoring in vessel speed results in an estimated time of arrival abeam at 2139.

You are steering a course of 316&deg;T, and a light bears 34&deg; on the port bow at 2053. At 2126 the same light bears 68&deg; on the port bow, and you have run 5 miles since the first bearing. What is the ETA when the lighthouse is abeam?

You are steering a course of 316°T, and a light bears 34° on the port bow at 2053. At 2126 the same light bears 68° on the port bow, and you have run 5 miles since the first bearing. What is the ETA when the lighthouse is abeam?