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	Eng ID	Term	Definition
	821	clamping error	See ERROR.
	822	clamp (or clamping) screw	A screw for holding in place a moving part of an instrument as during an OBSERVATION or reading with a THEODOLITE or SEXTANT.
	823	clamshell snapper	See SNAPPER.
	824	clapotis	The French equivalent for a type of STANDING WAVE.
	825	Clarke's spheroid	See REFERENCE SPHEROID.
	826	clay	Mineralogically, a hydrous aluminium silicate material with plastic properties and a crystal structure. As a size term, refers to sediment ... more Mineralogically, a hydrous aluminium silicate material with plastic properties and a crystal structure. As a size term, refers to sediment particles ranging from 0.0039 to 0.00024 millimeter, in which case it includes rock flour, calcareous muds, aragonite, etc.
	827	clean	(adj.). Free from OBSTRUCTIONS, unevenness, imperfections, as a clean ANCHORAGE.
	828	clear	(v.t.). To make such distance from an object as to have open sea-room.
	829	clearance	In NAVIGATION, a safe distance off a danger. In METEOROLOGY: a) decrease of total CLOUD AMOUNT when the latter is large; b) TIME at which t... more In NAVIGATION, a safe distance off a danger. In METEOROLOGY: a) decrease of total CLOUD AMOUNT when the latter is large; b) TIME at which this decrease takes place; c) gap in a cloud layer covering the entire sky. Also calledclearing.
	830	clearance: bridge	Minimum vertical or horizontal space available for passage.
	831	clearance: overhead pipeline	Minimum vertical or horizontal space available for passage.
	832	clearance: safe overhead	The HEIGHT above the VERTICAL CONTROL DATUM at which the highest points of a ship can pass under an overhead power CABLE without risk of ele... more The HEIGHT above the VERTICAL CONTROL DATUM at which the highest points of a ship can pass under an overhead power CABLE without risk of electrical discharge from the cable to the ship or without making contact with a BRIDGE.
	833	cleared depth	The effective depth over a feature, obtained by a wire drag survey.
	834	clearing	See CLEARANCE.
	835	clearing line	A straight line, on a CHART, that marks the BOUNDARY between a safe and a dangerous area; or that passes clear of a navigational danger. Sec... more A straight line, on a CHART, that marks the BOUNDARY between a safe and a dangerous area; or that passes clear of a navigational danger. Sectors of lighthouse lights are usually bounded by them.
	836	clearing marks	Selected MARKS, natural or otherwise, used to help vessels keep clear of dangers.
	837	clear sweeping	A form of BAR SWEEPING. A sweep, set at a predetermined depth, and passed over an area to ensure that no obstructions have been missed.
	838	cliff	LAND rising abruptly for a considerable distance above the water or surrounding LAND.
	839	climate	Fluctuating aggregate of atmospheric conditions characterized by the states and developments of the WEATHER of a given area.
	840	climatology	Study of CLIMATES (causes, variations, distributions, types, etc.).
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