Your vessel is on course 270°T, speed 10 knots. The apparent wind is from 10° off the port bow, speed 30 knots. From which direction is the true wind?

Correct Answer: Option D — 255°T

Applying vector triangle solutions for true wind from apparent wind and vessel motion per Bowditch methods, a ship heading 270°T at 10 knots with an apparent wind of 30 knots from 10° port yields a true wind direction of 255°T.