Definition
A light showing an unbroken arc of the horizon of 360 degrees. All-round lights serve as anchor lights, as the status lights of vessels not under command, restricted in ability to manoeuvre, constrained by draught, fishing or engaged on pilotage duty, and as the combined masthead and sternlight permitted to a power-driven vessel of less than 12 metres. Minimum range is generally 2 miles, rising to 3 miles for vessels of 50 metres or more.
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