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	Eng ID	Term	Definition
	3181	mean range (of tide)	The difference in the HEIGHT between MEAN HIGH WATER and MEAN LOW WATER.
	3182	mean rise (of tide)	The HEIGHT of MEAN HIGH WATER above the CHART DATUM.
	3183	mean sea level	The average HEIGHT of the surface of the SEA at a TIDE STATION for all stages of the TIDE over a 19-year period, usually determined from h... more The average HEIGHT of the surface of the SEA at a TIDE STATION for all stages of the TIDE over a 19-year period, usually determined from hourly height readings measured from a fixed predetermined reference level (CHART DATUM).
	3184	mean solar day	See DAY: SOLAR.
	3185	mean solar time	See TIME.
	3186	mean sounding velocity	Mean values for VELOCITY OF SOUND through the vertical water column of specific DEPTHS based on different VELOCITIES OF SOUND in different... more Mean values for VELOCITY OF SOUND through the vertical water column of specific DEPTHS based on different VELOCITIES OF SOUND in different sections of the column. These values yield more nearly correct DEPTHS when sonic DEPTH FINDERS are used. The VELOCITY OF SOUND at any specific DEPTH may differ considerably from the mean.
	3187	mean sphere depth	The uniform DEPTH to which the water would cover the EARTH if the solid surface were smoothed off and were parallel to the surface of the ... more The uniform DEPTH to which the water would cover the EARTH if the solid surface were smoothed off and were parallel to the surface of the GEOID. The accepted figure for this DEPTH is 2,440 METRES. The mean DEPTH of the SEA is 3,800 METRES.
	3188	mean spring range	See SPRING RANGE.
	3189	mean spring rise	The HEIGHT of MEAN HIGH WATER SPRINGS above the CHART DATUM. Also called spring rise.
	3190	mean square error	See ERROR.
	3191	mean sun	See SUN.
	3192	mean tide level	See HALF TIDE LEVEL.
	3193	mean time	See TIME: MEAN SOLAR.
	3194	mean water level	The average surface level of a body of water.
	3195	measured distance	A COURSE at SEA, whose ends are indicated by RANGES ashore, and whose length has been accurately measured for determining the SPEED of ves... more A COURSE at SEA, whose ends are indicated by RANGES ashore, and whose length has been accurately measured for determining the SPEED of vessels.
	3196	measured mile	A MEASURED DISTANCE of one NAUTICAL MILE.
	3197	measurement	The (detailed) dimensions of a physical quantity.
	3198	median line	A line every point of which is equidistant from the nearest points on the baselines of two or more states between which it lies.
	3199	median valley	The axial DEPRESSION of the mid-oceanic RIDGE system. See RIFT.
	3200	medimarimeter	An apparatus for recording the MEAN SEA LEVEL.
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