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

Accepted Answer

Option A: 20220. Per WMO meteorological coding standards for Ship's Weather Reports, group Nddff encodes cloud cover oktas (N), true wind direction tens of degrees (dd), and wind speed in knots (ff). With 25 percent cloud cover (2 oktas), apparent wind 062 degrees at 13 knots, vector math and code conversion yield 20220.