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| There are 93 entries in the glossary. |
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| Magnetic Bearing | The bearing of an object after magnetic variation has been considered, but without compensation for magnetic deviation. |
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| Magnetic Course | The course of a vessel after magnetic variation has been considered, but without compensation for magnetic deviation. |
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| Magnetic Deviation | Compass error. The difference between the reading of a compass and the actual magnetic course or bearing due to errors in the compass reading. These errors can be caused by metals, magnetic fields and electrical fields near the compass. The act of checking for magnetic deviation is called swinging. |
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| Magnetic North | The direction to which a compass points. Magnetic north differs from true north because the magnetic fields of the planet are not exactly in line with the north and south poles. Observed differences between magnetic and true north is known as magnetic variation. |
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| Magnetic Variation | The difference between magnetic north and true north, measured as an angle. Magnetic variation is different in different geographic locations, so the nearest compass rose to each location on a chart must be used. |
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| Main Beam | Transverse structural member supporting the deck and, in most modern sailboats, the deck-stepped mast; also the designated location of the ship's Official Number and (in some instances) Tonnage (affixed to or cut into the beam) |
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| Main Deck | The uppermost complete deck. |
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| Main Mast | Mayor
The tallest mast; the forward mast of a yawl or ketch; the mast furthest aft on a schooner |
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| Main Topsail | A topsail on the main mast. |
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| Mainsail | The principal sail that is set on the main mast. |
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| Mainsheet | The line that controls the angle of the mainsail in its relation to the wind. |
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| Make Fast | To attach a line to something so that it will not move. |
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| Make Way | Moving through the water. |
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| Man the Yards | On square-rigged ships, a form of ceremonial salute to honor the visit of a high official. The yards were lined by men standing upon them, and there was also a man standing on the truck of each topgallant mast. |
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| Manhole | A hole in a tank, boiler or compartment on a ship, designed to allow the passage of a man for examination, cleaning, and repairs. |
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