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	Eng ID	Term	Definition
	5761	ultra high frequency (UHF)	See FREQUENCY: RADIO.
	5762	ultrashort wave	See WAVE.
	5763	ultrasonic	(adj.). Having a FREQUENCY above the audible RANGE.
	5764	ultrasonic depth finder	See ECHO SOUNDER.
	5765	ultrasonics	The science and technology relating to SOUND WAVES of FREQUENCIES above the audible RANGE.
	5766	ultraviolet	(adj.). Having a FREQUENCY immediately beyond the violet end of the visible SPECTRUM. Said of RAYS of shorter WAVE LENGTH than visible light... more (adj.). Having a FREQUENCY immediately beyond the violet end of the visible SPECTRUM. Said of RAYS of shorter WAVE LENGTH than visible light but longer than X-RAYS.
	5767	uncontrolled mosaic	A MOSAIC composed of uncorrected PRINTS, the detail of which has been matched from print to print without GROUND CONTROL or other ORIENT... more A MOSAIC composed of uncorrected PRINTS, the detail of which has been matched from print to print without GROUND CONTROL or other ORIENTATION.
	5768	uncovered	(adj.). Above water. The opposite is SUBMERGED.
	5769	uncovers	See COVERS AND UNCOVERS.
	5770	undercliff	A TERRACE or lower CLIFF formed by a LANDSLIDE. Also written as two words.
	5771	undercurrent	A CURRENT below the surface, particularly one flowing in a direction or at a SPEED differing from the SURFACE CURRENT.
	5772	underground mark	A STATION MARK set and plumbed below the centre of a SURFACE MARK and separated therefrom so as to preserve the STATION in case of accident ... more A STATION MARK set and plumbed below the centre of a SURFACE MARK and separated therefrom so as to preserve the STATION in case of accident to the SURFACE MARK. Also called subsurface mark.
	5773	underkeel clearance	The distance (usually a required minimum distance) between the lowest point of a ship's hull and the SEABED.
	5774	underkeel allowance	The minimum UNDERKEEL CLEARANCE estimated, or specified by a relevant authority for a defined area or vessel type, to account for vessels' s... more The minimum UNDERKEEL CLEARANCE estimated, or specified by a relevant authority for a defined area or vessel type, to account for vessels' static and dynamic characteristics, SEA STATE, CHART reliability, and variance from predicted HEIGHT of TIDE.
	5775	undertow	A seaward FLOW near the BOTTOM of a sloping BEACH. The subsurface return by gravity flow of the water carried up on SHORE by WAVES or BREAKE... more A seaward FLOW near the BOTTOM of a sloping BEACH. The subsurface return by gravity flow of the water carried up on SHORE by WAVES or BREAKERS. See also BACKRUSH.
	5776	underwater acoustics	A special field of technical acoustics dealing with the physics of sound propagation in the water.
	5777	underwater ice	See ANCHOR ICE.
	5778	underwater navigation	See NAVIGATION.
	5779	underwater photogrammetry	See PHOTOGRAMMETRY.
	5780	underwater position fixing	A method of position fixing for surface vessels, submersibles or towed devices in relation to a network of underwater acoustic beacons on th... more A method of position fixing for surface vessels, submersibles or towed devices in relation to a network of underwater acoustic beacons on the seabed with known relative positions.
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