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Question 1 of 2066636ee928f7522a1c51a623

Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. One-half of the sky is covered with clouds, and the anemometer indicates that the apparent wind is from 340° relative at 14 knots. You are on course 307° T at 12.6 knots. How should you encode group Nddff?

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Question 1 of 20

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🔍 Key Concepts

• Nddff group on WS Form B-80 (what each character represents: total cloud cover N, wind direction dd, wind speed ff) • Difference between apparent wind and true wind and how to convert using vessel course and speed • Coding total cloud amount in oktas (eighths of sky cover) for the N digit

💭 Think About

• First, decide what value N should be when exactly one-half of the sky is covered with clouds; how is that written in oktas? • Next, sketch a velocity triangle using the ship’s course and speed and the apparent wind (relative direction and speed). From that, determine the true wind direction and true wind speed. • Once you have the true wind direction (from which it blows), round it properly and convert it into the two-digit dd code, then match ff to the coded true wind speed.

✅ Before You Answer

• Be sure you are using true wind (not apparent) for ddff in this code group. • Confirm that N is coded in eighths (oktas), and that one-half sky cover matches the first digit you choose. • Verify that dd is the tens of degrees of the true wind direction (from which the wind blows), and that ff matches the true wind speed in knots, rounded according to the code instructions.

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