Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. Twenty-five percent of the sky is covered with clouds, and the anemometer indicates that the apparent wind is from 062° relative at 13 knots. You are on course 238°T at 22 knots. How should you encode group Nddff?

Question

Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. Twenty-five percent of the sky is covered with clouds, and the anemometer indicates that the apparent wind is from 062&deg; relative at 13 knots. You are on course 238&deg;T at 22 knots. How should you encode group Nddff?

Accepted Answer

Option A: 20220. The Nddff group encodes cloud cover (N) and true wind direction/speed (ddff). With 25% cloud cover (code 2), apparent wind direction from 062 relative on course 238T yields true wind direction 300T, and speed vector triangle calculations result in true wind speed of 20 knots, giving 20220.