USCG Exam PracticeLatitude, longitude, and geographic coordinates
A mariner is navigating in a confined channel where GPS signal is degraded by surrounding terrain. According to Bowditch, which method of navigation is most appropriate as the primary method in this situation?
- ✓ Piloting, by reference to landmarks, aids to navigation, and soundingsCorrect
- B. Dead reckoning, because it relies only on course and speed inputs internal to the vessel
- C. Celestial navigation, because it is independent of electronic infrastructure
- D. Electronic navigation using an ECDIS with vector ENC files as the primary reference
Why A is correct
Bowditch Ch. 1 §103 states that piloting is the primary method used in confined waters where dead reckoning alone is insufficient and electronic positioning may be obstructed by terrain or interference. Landmarks, aids to navigation, and soundings provide the required external references.
Cited:Bowditch Ch. 1 §103