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
 
|