USCG Exam PracticePlotting with variation and deviation (T-V-M-D-C)
Bowditch identifies several sources of navigational error. Which of the following is listed as a source from which cumulative errors must be checked against fixes whenever possible?
- ✓ Instrument error, observation error, plotting error, computation error, and the assumption that the vessel has held the planned courseCorrect
- B. Variation, deviation, index error, and dip
- C. Set, drift, leeway, and current prediction error
- D. Gyro error, radar range error, and GPS dilution of precision
Why A is correct
Bowditch Ch. 23 §2301 states that navigational errors arise from instrument error, observation error, plotting error, computation error, and the basic assumption that the vessel has held the planned course, and that cumulative errors must be checked against fixes whenever possible.
Cited:Bowditch Ch. 23 §2301