Glossary of Boating Terms

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mainsail

The largest regular sail on a sailboat.

make fast

To secure a line.

marinization

The addition of marine components to automotive engines.

mast

Vertical spar that supports sails.

MAYDAY

A radio distress call.

megayacht

A large, luxurious yacht, typically longer than 100 feet

midships

Location near the center of a boat.

mizzen mast

A shorter mast located aft of the main mast on a yawl or ketch.

modified-V hull

A modification of the deep-V hull shape with a deadrise of less than 20 degrees.

mold

A hollow reinforced cavity that is the mirror-image or reverse-image of the boat and into which fiberglass, gel coat and resin are laid during composite-hull construction.

monohull

A boat with a single hull.

mooring

Permanent ground tackle fixed to a buoy that boats can tie to.

motorsailer

A hybrid boat that has sails and powerful engines.

motoryacht

A large powerboat greater than 40 feet with luxurious interior accommodations for long-range cruising.

multihull

A boat with more than one hull, such as a catamaran or trimaran.