Rules of the Road · Signals to Attract Attention
Rule 36 permits the use of a searchlight to illuminate another vessel. What restriction applies?
- AThe searchlight must only be used in restricted visibility
- BThe searchlight must not be used in a manner that could embarrass or impede any other vessel✓ Correct
- CThe searchlight beam must not exceed 200,000 candela
- DOnly pilot vessels may use a searchlight under Rule 36
Explanation
Rule 36 expressly states that any light used to attract attention 'shall not be such as could be mistaken for any aid to navigation' and a searchlight must not be used 'in such a manner as to embarrass or impede any other vessel.' Blinding the bridge team of another vessel with a searchlight is specifically prohibited.
Authority: 72 COLREGS Rule 36
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