Chart Navigation & Plotting · Set & Drift — Speed Made Good
A vessel steering 000° at 10 kn experiences a current setting 000° at 2 kn (directly astern-to-ahead, i.e., a following current). Her speed made good is:
- A12 knots✓ Correct
- B8 knots
- C10 knots
- D2 knots
Explanation
A current setting in the same direction as the course adds directly: 10 + 2 = 12 knots speed made good. A current setting against the course (180° opposed) would subtract.
Authority: Bowditch (Pub. No. 9), current sailing
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