Maststep

The fitting (on deck or on the keel) into which the foot of the mast is stepped.

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Related M-terms

Mizzenmast

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

Magnetic

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

Mainsail

The principal sail set on the (main) mast of a sloop, cutter, ketch, or yawl.

Mainsheet

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

Mast

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

MOB button

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

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