Lights & Shapes Sounds Rules Buoyage Charts Quiz

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Light Characteristics

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A learning aid — not for navigation. Rule text is reproduced from the public-domain USCG Navigation Rules. Chart symbols follow NOAA U.S. Chart No. 1. All diagrams and questions are our own. Not affiliated with or endorsed by the RYA, ASA, NASBLA, IMO, or any licensing authority.

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Core content reviewed: July 15, 2026