USCG Exam PracticeLatitude, longitude, and geographic coordinates
A vessel is navigating in a confined waterway with significant terrain on both sides. GPS signal is intermittent. According to Bowditch, which method of navigation is most appropriate as the primary method under these conditions?
- A. Celestial navigation, because it is independent of terrain interference
- ✓ Piloting, by reference to landmarks, aids to navigation, and soundingsCorrect
- C. Electronic navigation using the last confirmed GPS fix as a reference
- D. Dead reckoning, because it requires no external signals
Why B is correct
Bowditch Ch. 1 §103 states that piloting — navigation by reference to landmarks, aids to navigation, and soundings — is the primary method used in confined waters where dead reckoning alone is insufficient and electronic positioning may be obstructed by terrain or interference.
Cited:Bowditch Ch. 1 §103