Your vessel is participating in the Voluntary Observing Ship Program. You are preparing WS Form B-80 as seen in illustration D041NG below. Three-quarters of the sky is covered with clouds, and the anemometer indicates that the apparent wind is from 226° relative at 17.7 knots. You are on course 020°T at 8 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. Three-quarters of the sky is covered with clouds, and the anemometer indicates that the apparent wind is from 226&deg; relative at 17.7 knots. You are on course 020&deg;T at 8 knots. How should you encode group Nddff?

Accepted Answer

Option B: 62324. Cloud cover of 6/8 to 7/8 is coded as 7. Apparent wind 226° relative at 17.7 knots, combined with course 020°T at 8 knots, requires vector addition to find true wind. The resulting true wind is 230° at 24 knots, leading to the WMO code 62324 for the Nddff group.