USCG Exam PracticeRunning fix from a single object
A vessel is steaming at 12 knots on course 270°T. At 1000, the navigator takes a relative bearing of 030° to a lighthouse. At 1030, the relative bearing to the same lighthouse is 060°. Applying the doubling-the-angle technique, what is the vessel's distance off the lighthouse at the time of the 1030 bearing?
- A. 12 nautical miles
- ✓ 6 nautical milesCorrect
- C. 3 nautical miles
- D. 24 nautical miles
Why B is correct
The doubling-the-angle technique states that the distance run between the two bearings equals the distance to the object at the second bearing. At 12 knots over 30 minutes, the vessel runs 6 nautical miles; therefore the distance off at the 1030 bearing is 6 nautical miles. (Bowditch Ch. 7 §703)
Cited:Bowditch Ch. 7 §703