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	Eng ID	Term	Definition
	4781	sill depth	The greatest depth over a sill.
	4782	silt	An unconsolidated SEDIMENT whose particles range in size from 0.0039 to 0.0625 millimetres in diameter (between CLAY and SAND size).
	4783	siltation	The deposition or accumulation of silt that is suspended in a body of water.
	4784	simplex	A method in which TELECOMMUNICATION between two stations takes place in one direction at a time.
	4785	simultaneous altitudes	ALTITUDES of two or more CELESTIAL BODIES observed at the same TIME.
	4786	simultaneous comparison of depths	The comparison of echo sounding depths with simultaneous direct vertical measurements of DEPTH. Simultaneous comparisons are periodically ma... more The comparison of echo sounding depths with simultaneous direct vertical measurements of DEPTH. Simultaneous comparisons are periodically made to determine the INSTRUMENTAL ERROR of ECHO SOUNDERS.
	4787	single beam echo sounder	(SBES) an ECHO SOUNDER that transmits and receives a sound pulse providing a single spot depth, as opposed to a MULTI BEAM ECHO SOUNDER.
	4788	single buoy mooring (SBM)	A large mooring buoy used by tankers to load and unload in port approaches or in offshore oil and gas fields.
	4789	single day tide	See TIDE: DIURNAL.
	4790	single point mooring (SPM)	A mooring structure used by tankers to load and unload in port approaches or in offshore oil and gas fields. The size of the structure can v... more A mooring structure used by tankers to load and unload in port approaches or in offshore oil and gas fields. The size of the structure can vary between a large mooring buoy and a manned floating structure.
	4791	sinker	WEIGHT used to sink fishing line or SOUNDING LINE.
	4792	sinking	A downward movement of surface water generally caused by converging CURRENTS or when water mass becomes more dense than the surrounding wa... more A downward movement of surface water generally caused by converging CURRENTS or when water mass becomes more dense than the surrounding water. See UPWELLING, and CONVERGENCE. An apparent lowering of distant terrestrial objects by abnormal ATMOSPHERIC REFRACTION. Because of sinking, objects normally visible at or near the HORIZON sometimes disappear below the HORIZON. The opposite is LOOMING.
	4793	siren	A type of FOG SIGNAL apparatus which produces SOUND by virtue of the passage of air through slots or holes in a revolving disk.
	4794	SI System	See SYSTÈME INTERNATIONAL.
	4795	sketch map	See MAP.
	4796	sketch survey	See SURVEY.
	4797	skew convergence	The angle, on a SKEWED PROJECTION, between TRUE NORTH and skew north.
	4798	skewed projection	See PROJECTION.
	4799	sky compass	See COMPASS.
	4800	sky wave	See WAVE.
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