Magnetic

Referring to the magnetic north pole rather than true geographic north.

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Related M-terms

Mast

The vertical spar — originally timber, today commonly aluminium or carbon — from which the…

Mainsheet

The control line that trims the mainsail in and out, running through a block system on the…

Mizzenmast

The shorter mast stepped aft of the mainmast on a ketch or yawl.

MOB button

A dedicated button on a GPS, chartplotter, or autopilot that marks the current position th…

Masthead

The top end of the mast, often carrying a wind instrument, anchor light, VHF antenna, and …

Mizzen

The small sail set on the mizzenmast of a ketch or yawl.

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