lubber line - A mark on a compass used to read the heading of a boat.
luff - The edge of a sailsail toward the bowbow of a boat.
lubber line
A mark or permanent line on a compass indicating the direction forward parallel to the keel when properly installed
luff ...
There is a compass in the shore box, which can be mounted on the after cabin wall, starboard side. Be sure to tumble the compass on its gimbals so that the Lubber Line (etched line that shows the straight-ahead direction) on the compass shows aft.
Lubber line: The black line parallel with ship's keel marked on the inner surface of the bowl of a compass, indicating the compass direction of the ship's head.
Lurch: The sudden heave of the ship.
 See also: Compass, Light, Boat, Bearing, Line
  
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