Rules of the Road · Light Visibility — Ranges
On a power-driven vessel 50 m or more in length, the masthead light must be visible at a minimum range of:
- A3 miles
- B5 miles
- C6 miles✓ Correct
- D2 miles
Explanation
For vessels 50 m or more: masthead 6 miles, sidelights 3 miles, sternlight/towing/all-round lights 3 miles. Shorter vessels have reduced minimum ranges.
Authority: COLREGS/Navigation Rules, Rule 22(a)
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