Navigation General · Currents
A vessel steers 090°T at 12 knots through the water. A current sets 000°T at 4 knots. Which best describes the effect on CMG?
- AThe CMG will be south of 090°T
- BThe CMG will remain exactly 090°T
- CThe CMG will be 045°T
- DThe CMG will be north of 090°T✓ Correct
Explanation
A northward current (set 000°T) will push the vessel north while it moves east. The resultant CMG will be northeast of the intended track — i.e., north of 090°T. The exact CMG depends on the vector addition of the two components.
Authority: Bowditch (Pub. 9), Ch. 7
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