Rules of the Road · Light Definitions & Visibility
According to the COLREGS, what is the minimum required visibility range for a masthead light on a vessel 50 meters or more in length?
- A2 miles
- B3 miles
- C5 miles
- D6 miles✓ Correct
Explanation
Rule 22(a) requires masthead lights on vessels 50 meters or more in length to be visible at a minimum range of 6 miles. Sidelights on the same vessels require 3 miles, and the sternlight requires 3 miles — masthead lights have the greatest range requirement.
Authority: 72 COLREGS Rule 22(a)
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