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denoting the presence of orontes bank off port vincent, south australia . beacons help guide navigators to their destinations. types of navigational beacons include radar reflectors, radio beacons , sonic and visual signals. visual beacons range from small, single-pile structures to large lighthouses or light
trucks, security personnel, construction vehicles, etc.); green for volunteer firefighters or for medical personnel, and violet for funerary vehicles. beacons may be constructed with halogen bulbs similar to those used in vehicle headlamps , xenon flashtubes , or leds . [ ] incandescent and xenon light...
https://en.wikipedia.org/wiki/Beacon