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	Eng ID	Term	Definition
	3141	mark boat	A temporary SOUNDING MARK consisting of a whaler moored head and stern, with a SIGNAL on board.
	3142	marker	That which marks something. A MARKER BEACON. See also RADIOBEACON.
	3143	marker beacon	A RADIOBEACON which radiates a SIGNAL to define an area, as an AID TO NAVIGATION. Usually called marker radiobeacon or marker.
	3144	marker buoy	A temporary BUOY used in SURVEYING to mark a location of particular interest such as a SHOAL or REEF. See also STATION BUOY.
	3145	marker radiobeacon	See MARKER BEACON.
	3146	marks and deeps	The divisions used in marking a hand LEAD LINE.
	3147	marl	A crumbling, earthy DEPOSIT, particularly one of CLAY mixed with SAND, lime, decomposed SHELLS, etc. Sometimes a LAYER of marl becomes quite... more A crumbling, earthy DEPOSIT, particularly one of CLAY mixed with SAND, lime, decomposed SHELLS, etc. Sometimes a LAYER of marl becomes quite compact. Part of the ocean bed is composed of marl.
	3148	Marsden chart	A system introduced by Marsden early in the nineteenth century for showing the distribution of meteorological DATA on a CHART especially ove... more A system introduced by Marsden early in the nineteenth century for showing the distribution of meteorological DATA on a CHART especially over the OCEANS. A Mercator map projection is used; the world between 90°N and 80°S being divided into Marsden 'squares' each of 10 degrees latitude by 10 degrees longitude. These squares are systematically numbered to indicate position. Each square may be divided into quarter squares, or into 100 one-degree subsquares numbered from 00 to 99 to give the position to the nearest degree.
	3149	marsh	A tract of low-lying LAND flooded at times and generally swampy.
	3150	massif	A large mountain-mass; the central mass of a MOUNTAIN; a compact and more or less independent portion of a RANGE.
	3151	mass transport	In OCEANOGRAPHY, the voluminous transfer of water from one region to another.
	3152	master	An instrument which controls another similar instrument called a REPEATER. A MASTER STATION.
	3153	master compass	See COMPASS.
	3154	master gyro compass	See COMPASS.
	3155	master station	The governing station of two or more synchronized transmitting stations. Often shortened to MASTER. See SLAVE STATION.
	3156	masthead	The top of a mast.
	3157	masthead angle	The vertical angle subtended by a ship's mast.
	3158	mathematical model	A mathematical representation, usually of a process, device, or concept, which permits mathematical manipulation of variables as a means t... more A mathematical representation, usually of a process, device, or concept, which permits mathematical manipulation of variables as a means to determine how the process, device, or concept would behave in various situations as e.g. the application of a specific simulation.
	3159	Matthews table	An echo sounding correction table.
	3160	matrix	In OCEANOGRAPHY, ROCK or SEDIMENT in which larger grains are embedded in a mass of smaller grains. In printing, a metal plate, usually of co... more In OCEANOGRAPHY, ROCK or SEDIMENT in which larger grains are embedded in a mass of smaller grains. In printing, a metal plate, usually of copper, for moulding the face of a type. In graphic arts, a mold in which type characters are cast in line-casting machines and foundry type.
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