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	Eng ID	Term	Definition
	4861	sonic frequency	See AUDIOFREQUENCY.
	4862	sonic line of position	A LINE OF POSITION determined by means of SOUND WAVES. Also called acoustic line of position.
	4863	sonic navigation	See NAVIGATION.
	4864	sonic wave	See WAVE: SOUND.
	4865	sono-buoy	A BUOY with equipment for automatically transmitting a radio signal when triggered by an underwater SOUND SIGNAL.
	4866	sono-radio buoy	See SONOBUOY.
	4867	sound	A relatively long ARM OF THE SEA forming a CHANNEL between an ISLAND and a MAINLAND or connecting two larger bodies of water, as a SEA and t... more A relatively long ARM OF THE SEA forming a CHANNEL between an ISLAND and a MAINLAND or connecting two larger bodies of water, as a SEA and the OCEAN, or two parts of the same body but usually wider and more extensive than a STRAIT. A vibratory disturbance in air or some other elastic medium, capable of being heard by the human ear, and thus of any FREQUENCY between about 20 and 20,000 CYCLES PER SECOND.
	4868	sound	(v.i.). To measure the DEPTH of the water.
	4869	sound buoy	See BUOY.
	4870	sound channel	The region in the water column where SOUND VELOCITY first decreases to a minimum value with DEPTH and then increases in value as a result of... more The region in the water column where SOUND VELOCITY first decreases to a minimum value with DEPTH and then increases in value as a result of pressure. Above the minimum value SOUND RAYS are bent downward, and below the minimum value SOUND RAYS are bent upward; the RAYS are thus trapped in this CHANNEL. SOUND travelling in a deep channel can be detected thousands of MILES from the sound source.
	4871	sounder	A machine or apparatus for SOUNDING. An ECHO SOUNDER.
	4872	sounder: echo	See ECHO SOUNDER.
	4873	sounding	Measured or charted DEPTH of water, or the measurement of such a DEPTH. In METEOROLOGY, determination of one or several upper-air meteorolo... more Measured or charted DEPTH of water, or the measurement of such a DEPTH. In METEOROLOGY, determination of one or several upper-air meteorological elements by means of instruments carried up by balloon, aircraft, kite, glider, ROCKET, SATELLITE, etc.
	4874	sounding: acoustic	See ECHO SOUNDING.
	4875	sounding: danger	A minimum SOUNDING chosen for a vessel of specific DRAFT in a given area to indicate the limit of safe NAVIGATION.
	4876	sounding(s): detached	Those SOUNDINGS, including least DEPTHS on SHOALS, whose POSITIONS were accurately located. See POSITION: DETACHED.
	4877	sounding: doubtful	A DEPTH shown on a CHART over a SHOAL, a ROCK, etc., that may be less than that indicated.
	4878	sounding: drift	A method of finding the least DEPTH in a shoal area by letting the boat drift along a series of closely spaced, previously run parallel SOUN... more A method of finding the least DEPTH in a shoal area by letting the boat drift along a series of closely spaced, previously run parallel SOUNDING LINES, while the LEADSMAN sounds or 'feels' along the BOTTOM. The operation is repeated until the SHOAL is found or the area is covered.
	4879	sounding: echo	See ECHO SOUNDING.
	4880	sounding: fixed angle	A method consisting in sounding along the arcs of circles subtended by two objects whose POSITION is known. For each arc, an angle remains ... more A method consisting in sounding along the arcs of circles subtended by two objects whose POSITION is known. For each arc, an angle remains constant (fixed angle) and the second angle, between another pair of objects, defines the POSITION of the vessel along the arc. By varying the fixed angle successively by equal amounts, a series of LINES OF SOUNDING covering the area systematically can be run. See FIXED ANGLE PLOT.
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