Question 489Navigation General

70% to pass

The numeral in the center of a wind rose circle on a pilot chart indicates the _______________.

A percentage of calms
B average wind force on the Beaufort scale
C total number of observations
D average wind force in knots
AI Explanation

The correct answer is A) percentage of calms. The numeral in the center of a wind rose circle on a pilot chart indicates the percentage of calms, or the percentage of time that there was no wind observed at that location. This information is typically provided on pilot charts to give mariners a comprehensive understanding of the wind patterns and conditions in the area covered by the chart. The other answer choices are incorrect because they do not accurately describe the information provided by the numeral in the center of the wind rose. The average wind force on the Beaufort scale (B), the total number of observations (C), and the average wind force in knots (D) are not what the central numeral represents on a pilot chart wind rose.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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