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	Eng ID	Term	Definition
	1481	drift buoy	A DATA collection BUOY which is not moored to the sea bottom, but drifting freely in response to currents, tides, and wind.
	1482	drift current	See CURRENT.
	1483	drift ice foot	See RAMP.
	1484	drifting logship	A LOGSHIP employed for the measurement of TIDAL STREAMS and CURRENTS. It is allowed to drift freely while its POSITIONS are fixed, during th... more A LOGSHIP employed for the measurement of TIDAL STREAMS and CURRENTS. It is allowed to drift freely while its POSITIONS are fixed, during the PERIOD of OBSERVATION, by an accompanying boat, or from STATIONS ashore.
	1485	drift lead	See LEAD.
	1486	drift sounding	See SOUNDING.
	1487	drift station	A scientific station established on the ICE of the Arctic Ocean. A term sometimes used in shoran operations to designate the ground station ... more A scientific station established on the ICE of the Arctic Ocean. A term sometimes used in shoran operations to designate the ground station about which the aircraft flies. The second station is then referred to as rate station.
	1488	driver rod	A device employed together with a SINKER to obtain BOTTOM SAMPLES when WIRE SOUNDING. It consists, essentially, of a galvanized iron tube th... more A device employed together with a SINKER to obtain BOTTOM SAMPLES when WIRE SOUNDING. It consists, essentially, of a galvanized iron tube the lower part of which contains a flap valve for retaining a bottom specimen. The tube releases the SINKER when it strikes the BOTTOM. Also called driver tube.
	1489	driver tube	See DRIVER ROD.
	1490	drizzle	Fairly uniform PRECIPITATION composed exclusively of fine drops of water (diameter less than 0.5 mm), very close to one another.
	1491	drogue	A current measuring assembly consisting of a weighted parachute and an attached surface buoy. Also called parachute drogue.
	1492	drum	A rotating cylinder on which is set a registering card or paper for recording purposes. Cylinder around which CABLE is wound in a winch.
	1493	drum plotter	A plotter which uses a rotating drum or cylinder to move the drawing base in the direction of one coordinate axis while the plotting head on... more A plotter which uses a rotating drum or cylinder to move the drawing base in the direction of one coordinate axis while the plotting head only moves along the other coordinate axis.
	1494	dry bulb thermometer	See THERMOMETER.
	1495	dry (or dry card) compass	See COMPASS.
	1496	dry dock	See DOCK.
	1497	drying heights	HEIGHTS above SOUNDING DATUM, of any areas (BANKS, FORESHORES, ROCKS, etc.) which dry at LOW WATER.
	1498	drying line	The line marking the transit from water to land; usually the low-water line.
	1499	drying reef	A reef or part thereof which dries at low water.
	1500	dry proof	An impression of a CHART pulled from the engraved PLATE onto a dry sheet of paper. This impression is fainter than a damp-pulled copy and un... more An impression of a CHART pulled from the engraved PLATE onto a dry sheet of paper. This impression is fainter than a damp-pulled copy and unsuitable for ordinary use but is free from DISTORTION.
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