Lubber line

lubber's line
A lubber line is a fixed line on a compass binnacle or radar plan position indicator display pointing towards the front of the ship or aircraft and corresponding to the craft's centerline (being the customary direction of movement).wikipedia
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Compass

magnetic compassDigital compassmariner's compass
A lubber line is a fixed line on a compass binnacle or radar plan position indicator display pointing towards the front of the ship or aircraft and corresponding to the craft's centerline (being the customary direction of movement).
First the lubber line can be adjusted so that it is aligned with the direction in which the ship travels, then the effects of permanent magnets can be corrected for by small magnets fitted within the case of the compass.

Plan position indicator

plan-position indicatorPPICAPPI
A lubber line is a fixed line on a compass binnacle or radar plan position indicator display pointing towards the front of the ship or aircraft and corresponding to the craft's centerline (being the customary direction of movement).
For moving installations, such as small ship and aircraft radars, the top may represent the bow or nose of the ship or aircraft, i.e., its heading (direction of travel) and this is usually represented by a lubber line.

Binnacle

Kelvin's balls
A lubber line is a fixed line on a compass binnacle or radar plan position indicator display pointing towards the front of the ship or aircraft and corresponding to the craft's centerline (being the customary direction of movement).

Radar

radar stationradarsradar system
A lubber line is a fixed line on a compass binnacle or radar plan position indicator display pointing towards the front of the ship or aircraft and corresponding to the craft's centerline (being the customary direction of movement).

Degree (angle)

°degreesdegree
The line represents 0 degrees and is therefore the zero-point from which relative bearings are measured, e.g., "twenty-degrees to port".

Port and starboard

starboardportstarboard side
The line represents 0 degrees and is therefore the zero-point from which relative bearings are measured, e.g., "twenty-degrees to port".

Pelorus (instrument)

peloruspeloruses
It is generally used by setting 000° at the lubber's line.

History of the compass

dry compasscompassmagnetic needle compass
A bearing compass is a magnetic compass mounted in such a way that it allows the taking of bearings of objects by aligning them with the lubber line of the bearing compass.