USCG Exam PracticeLeeway allowance in plotting
A navigational error check performed after a running fix reveals the vessel is set to the north of the DR position. According to Bowditch, which of the following is a recognized source of such cumulative navigational error?
- A. Failure to sound required signals at a bend in the channel
- B. Failure to account for traffic separation scheme boundaries
- ✓ The basic assumption that the vessel has held the planned courseCorrect
- D. Incorrect application of ARPA vector time scale
Why C 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. This last source directly accounts for set and drift producing a difference between the DR and actual position.
Cited:Bowditch Ch. 23 §2301