PostHeaderIcon Aids-to-navigation

any devices external to a boat specifically intended to assist in determining a position or safe course, or to warn of danger or obstructions. These include buoys, day beacons, lighthouses, markers, radio beacons, and range lights. Aids-to-navigation are typically shown on nautical charts. Electronic devices used for navigation are also called aids-to-navigation. Alternative terms include ATON and navaid.

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