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	Eng ID	Term	Definition
	5801	Universal Transverse Mercator (UTM) grid	See GRID.
	5802	unprotected reversing thermometer	See THERMOMETER.
	5803	unrecoverable station	See STATION.
	5804	unsurveyed area	An area where HYDROGRAPHIC SURVEY data is non-existent.
	5805	unsurveyed clearance depth	The estimated depth over an unsurveyed wreck or obstruction over which the exact depth is unknown but which is considered to have a safe cle... more The estimated depth over an unsurveyed wreck or obstruction over which the exact depth is unknown but which is considered to have a safe clearance to the depth shown.
	5806	upland	The higher GROUND of a region contrasted with the VALLEYS and PLAINS. Used in contrast to LOWLAND.
	5807	uplifted reef	A CORAL REEF exposed above water level.
	5808	upper branch	That half of a MERIDIAN or CELESTIAL MERIDIAN from POLE to POLE which passes through a place or its ZENITH.
	5809	upper culmination	Upper TRANSIT.
	5810	upper limb	See LIMB.
	5811	upper limit of navigability	The character of a river will, at some point along its length, change from navigable to non‑navigable. Very often that point will be at a ... more The character of a river will, at some point along its length, change from navigable to non‑navigable. Very often that point will be at a major fall or rapids, or other place where there is a marked decrease in the navigable capacity of the river. The upper limit will therefore often be the same point traditionally recognized as the head of navigation, but may, under some of the tests described above, be at some point yet farther upstream.
	5812	upper transit	See MERIDIAN TRANSIT.
	5813	uprush	The rush of water up onto the BEACH following the breaking of a WAVE. See RUN-UP.
	5814	upstream	(adj. & adv.). Toward the SOURCE of a STREAM. The opposite is DOWNSTREAM.
	5815	upwelling	The process by which water rises from a lower to a higher DEPTH, usually as a result of DIVERGENCE and offshore CURRENTS. See SINKING.
	5816	upwind	(adj. & adv.). In the direction from which the WIND is blowing. The opposite is DOWNWIND.
	5817	vacuum lead	A CORER which makes use of HYDROSTATIC PRESSURE to force a tube into the BOTTOM SEDIMENT.
	5818	valley	A long DEPRESSION or hollow in the LAND lying between HILLS or stretches of high GROUND and usually having a RIVER or STREAM flowing along t... more A long DEPRESSION or hollow in the LAND lying between HILLS or stretches of high GROUND and usually having a RIVER or STREAM flowing along the bottom.
	5819	valley: median	See MEDIAN VALLEY.
	5820	valley: submarine	A relatively shallow wide DEPRESSION, the bottom of which usually has a continuous GRADIENT. This term is generally not used for features th... more A relatively shallow wide DEPRESSION, the bottom of which usually has a continuous GRADIENT. This term is generally not used for features that have CANYON-like characteristics for a significant portion of their extent.
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