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 __________.

Question

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

Accepted Answer

Option B: 127&deg;T, 21 knots. True wind is the vector sum of apparent wind and the vessel's motion. Using vector addition (or a maneuvering board), the vessel's motion (195° at 15 knots) combined with the apparent wind (235° at 30 knots) results in a true wind direction of 127°T at a speed of 21 knots.

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

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 __________.