USCG Exam Practice · Leeway allowance in plotting
A navigational error arises from which of the following sources, according to Bowditch?
- AInstrument error, observation error, plotting error, computation error, and the assumption that the vessel held the planned course✓ correct
- BCompass deviation, variation, current set, and leeway only
- CGPS signal degradation, chart datum errors, and tidal prediction errors only
- DObservation error and plotting error only, as computation errors are eliminated by electronic navigation
Why A is correct
Bowditch Ch. 23 §2301 identifies navigational errors as arising from instrument error, observation error, plotting error, computation error, and the basic assumption that the vessel has held the planned course. All five sources must be considered and cumulative errors checked against fixes.
Cited:Bowditch Ch. 23 §2301
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