Leading lights (also known as range lights in the United States) are a pair of light beacons, used in navigation [2] to indicate a safe passage for vessels entering a shallow or dangerous channel; and may also be used for position fixing.
Leading Lights
Lights that are separated in distance so that when they are lined up with one behind the other they provide a bearing. Usually used to enter a harbor or navigate a channel.
Leading Marks ...
Leading lights are lighted at night and serve the same purpose.
League - A measure of distance approximately 3 nautical miles. One-twentieth of a degree of latitude.
It is customary to mark entry to a port with a line of leading lights to show the way.
In 1795 the issue of lime juice aboard British naval ships was regularised to prevent scurvy amongst sailors.
leading marks - Unlit navigational aids for use during the day. Like leading lights, they mark a bearing to a channel when they are lined up one above the other.
league - 3 nautical miles.
Leading light:
It was customary to mark the entry to a port with a line of leading lights to show the way. Someone who shows the way or is a leader is called a "leading light".
 See also: Luff, Lines, Cleat, Boat, Hoist
  
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