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- Q141 - Navigation Problems: Near Coastal
245. Your vessel is on a course of 255° T, at 14 knots. At 2126 a lighthouse is sighted dead ahead at a distance of 11 miles. You change course at this time to pass the lighthouse 3 miles abeam to port. What will be your ETA at this position off the lighthouse?
After altering course, the distance to steam to pass 3 miles abeam is calculated using the Pythagorean theorem. The time required is then determined by dividing the tangent distance by the vessel's speed, resulting in an ETA of 2211.
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