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 Marks:
Unlit navigational aids for use during the day. They mark a bearing to a channel when they are lined up one above the other. Leading lights are lighted at night and serve the same purpose.
 See also: Globe, Line, Lightship, Lighthouse, Light
  
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