Your vessel is on a course of 237°T at 18 knots. At 0404 a light bears 263.5°T, and at 0430 the light bears 282°T. At what time and at what distance off will your vessel be when abeam of the light?

Question

Your vessel is on a course of 237&deg;T at 18 knots. At 0404 a light bears 263.5&deg;T, and at 0430 the light bears 282&deg;T. At what time and at what distance off will your vessel be when abeam of the light?

Accepted Answer

Option A: 0456, 7.8 miles. Apply the principles of running fixes and relative motion. The change in bearing (263.5° to 282°) over 26 minutes allows for calculating the distance run between bearings. Using the law of sines or standard piloting tables, the distance off when abeam is 7.8 miles at 0456.

Your vessel is on a course of 237&deg;T at 18 knots. At 0404 a light bears 263.5&deg;T, and at 0430 the light bears 282&deg;T. At what time and at what distance off will your vessel be when abeam of the light?

Your vessel is on a course of 237°T at 18 knots. At 0404 a light bears 263.5°T, and at 0430 the light bears 282°T. At what time and at what distance off will your vessel be when abeam of the light?