Marlinspike

A tapered metal spike used to loosen knots, open rope lays, and work splices.

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Multi-Function Display — a large chartplotter screen able to show radar, AIS, sonar, engin…

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Mainsheet

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Mizzenmast

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

Masthead

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

MOB button

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