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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 ho... 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 G... 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 ves­s... 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.