Definition
A light vessel is a purpose-built moored hull with a lantern on a mast; a Lanby is a large automatic navigational buoy, typically around 12 metres in diameter, deployed where a light vessel is uneconomic. Both are shown on the chart as a floating symbol with a magenta flare, and both may carry a racon, AIS transmitter and fog signal. Because they lie to a mooring, they swing and their position tolerance exceeds that of a fixed structure.
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