USCG Exam PracticeRunning fix from a single object
For the doubling-the-angle technique to produce a valid running fix from a single charted object, which condition must be met between the two observations?
- A. The vessel must come to a full stop between bearings
- ✓ The relative bearing to the object must change substantiallyCorrect
- C. The vessel must maintain a relative bearing of exactly 45 degrees at the first observation
- D. The two bearings must be taken simultaneously by two observers
Why B is correct
Bearings to a single object can produce a running fix when the relative bearing changes substantially. The doubling-the-angle technique specifically relies on a meaningful change in relative bearing between the two observations. (Bowditch Ch. 7 §703)
Cited:Bowditch Ch. 7 §703