Definition
A visual, acoustical, or RADIO device, external to a ship, designed to assist in determining a safe COURSE or a vessel’s POSITION, or to warn of dangers and/or OBSTRUCTIONS. Aids to navigation usually include BUOYS, BEACONS, FOG SIGNALS, LIGHTS, RADIO BEACONS, LEADING MARKS, RADIO position fixing systems and GNSS which are chart-related and assist safe NAVIGATION.