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	Eng ID	Term	Definition
	1121	covers and uncovers (or discovers)	Expression intended to indicate an area of a REEF or other projection from the BOTTOM of a body of water which periodically extends above an... more Expression intended to indicate an area of a REEF or other projection from the BOTTOM of a body of water which periodically extends above and is submerged below the surface. Also referred to as dries or uncovers.
	1122	crab	The condition caused by failure to orient a CAMERA with respect to the TRACK of the airplane. In vertical PHOTOGRAPHY, crab is indicated b... more The condition caused by failure to orient a CAMERA with respect to the TRACK of the airplane. In vertical PHOTOGRAPHY, crab is indicated by the edges of the PHOTOGRAPHS not being parallel to the airbase lines.
	1123	crack	Any fracture or RIFT in SEA ICE not sufficiently wide to be described as a LEAD.
	1124	crag	A steep or precipitous rugged ROCK.
	1125	crater	Bowl-shaped cavity, at the SUMMIT or on the side of a volcano.
	1126	creek	A comparatively narrow INLET, of fresh or salt water, which is tidal throughout its whole course. A small TRIBUTARY. A small, narrow BAY whi... more A comparatively narrow INLET, of fresh or salt water, which is tidal throughout its whole course. A small TRIBUTARY. A small, narrow BAY which extends farther inland than a COVE.
	1127	crescent	(adj.). See PHASES OF THE MOON.
	1128	crest	The highest part of a WAVE, SWELL, RIDGE, etc.
	1129	crib	A permanent marine structure usually designed to support or elevate pipelines; especially a structure enclosing a screening device at the of... more A permanent marine structure usually designed to support or elevate pipelines; especially a structure enclosing a screening device at the offshore end of a potable water intake pipe. The structure is commonly a heavy timber enclosure that has been sunken with rocks or other debris.
	1130	critical sounding	The least depth in proximity to a known or potential navigational route.
	1131	cross bearings	Two or more BEARINGS used as intersecting LINES OF POSITION for fixing the POSITION of a craft.
	1132	cross hairs	See CROSS WIRES.
	1133	crossing angle	See ANGLE.
	1134	crosslines	Sounding lines that cross the main system of lines at either right angles or at an oblique angle to serve as a check on the accuracy of the ... more Sounding lines that cross the main system of lines at either right angles or at an oblique angle to serve as a check on the accuracy of the work.
	1135	cross lines of sounding	SOUNDING LINES run approximately at right angles to those of normal direction, frequently useful when examining SHOALS. Cross lines are also... more SOUNDING LINES run approximately at right angles to those of normal direction, frequently useful when examining SHOALS. Cross lines are also run after completing the main system of SOUNDING LINES, with the purpose of checking them.
	1136	cross sea	A series of WAVES or SWELL crossing another wave system at an angle.
	1137	cross section lines of soundings	SOUNDING LINES run in a SURVEY perpendicular to the FLOW of a STREAM and from BANK to BANK in a RIVER.
	1138	cross wind	WIND which blows in a direction perpendicular to that of the motion of a moving object, relative to the EARTH's surface.
	1139	cross wires (or hairs)	Wires or etched lines, at right angles, held at the FOCAL PLANE of an astronomical or sighting TELESCOPE. See also RETICLE.
	1140	cruise line of sounding	See TRACK LINE OF SOUNDING.
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