Mainmast: - the tallest mast of the ship; on a schooner, the mast
- The sail set on the mainmast.-the lowest square sail on the mainmast.
Marlinspike - A tool for opening the strands of a rope while splicing
./ The art of working with ropes
Mast: - a large wooden pole used to hold up the sails
Measured mile-A course marked by buoys or ranges
measuring one nautical mile.
Messenger-A small line used to pull a heavier line or
Mizzen - the shorter mast behind the main mast on a ketch or yawl.
Monohull -A boat with one hull.
Mooring -An arrangement for securing a boat to a mooring buoy or a pier.
Mooring buoy -A buoy secured to a permanent anchor sunk deeply into the