Question 794Navigation General

70% to pass

A ship is on course 195° at a speed of 15 knots. The apparent wind is from 40° on the port bow, speed 30 knots. The direction and speed of the true wind are _______________.

A 068°T, 30 knots
B 127°T, 21 knots
C 263°T, 42 knots
D 292°T, 42 knots
AI Explanation

The correct answer is B) 127°T, 21 knots. To determine the direction and speed of the true wind, we need to use vector addition. The ship's course and speed, combined with the apparent wind direction and speed, can be used to calculate the true wind. The correct answer of 127°T, 21 knots is derived by applying the vector addition of the ship's motion and the apparent wind to determine the true wind. The other answer choices do not correctly apply this vector addition principle to arrive at the true wind direction and speed.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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