USCG Exam PracticeDead reckoning — DR plot maintenance
Which of the following is NOT identified in Bowditch as a source of navigational error that can affect DR plot accuracy?
- A. Instrument error
- B. Plotting error
- ✓ Tidal height variationCorrect
- D. Computation error
Why C is correct
Bowditch Ch. 23 §2301 identifies instrument error, observation error, plotting error, computation error, and the assumption of holding planned course as sources of navigational error. Tidal height variation is not listed among those sources in the supplied chunks.
Cited:Bowditch Ch. 23 §2301