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	Eng ID	Term	Definition
	1341	deviation: magnetic	The angle between the COMPASS NEEDLE and the MAGNETIC MERIDIAN, expressed in degrees east or west of MAGNETIC MERIDIAN. Also called deviatio... more The angle between the COMPASS NEEDLE and the MAGNETIC MERIDIAN, expressed in degrees east or west of MAGNETIC MERIDIAN. Also called deviation.
	1342	deviation: quadrantal	DEVIATION which changes its sign (E or W) approximately each 90° change of HEADING. It is caused by INDUCED MAGNETISM in horizontal SOFT IR... more DEVIATION which changes its sign (E or W) approximately each 90° change of HEADING. It is caused by INDUCED MAGNETISM in horizontal SOFT IRON.
	1343	deviation: residual	DEVIATION of a MAGNETIC COMPASS after COMPENSATION.
	1344	deviation: semicircular	DEVIATION which changes sign (E or W) approximately each 180° change of HEADING.
	1345	deviation: standard	See ERROR: STANDARD.
	1346	deviation of the vertical	See DEFLECTION OF THE VERTICAL.
	1347	deviation table	A TABLE of the DEVIATION of a MAGNETIC COMPASS on various HEADINGS, magnetic or compass.
	1348	dew	Deposit of water drops on objects at or near the GROUND, produced by the condensation of water vapour from the surrounding clear air.
	1349	dew-point	The temperature to which air must be cooled at constant pressure and constant water vapour content to reach saturation.
	1350	DGPS	See DIFFRERENTIAL GPS
	1351	diagenesis	The chemical and physical changes that SEDIMENTS undergo after their deposition, by LITHIFICATION.
	1352	diagram	A graphic representation of certain DATA.
	1353	dial	The face of a WATCH or CLOCK. The clockwise face of an instrument for indicating, as by a moving pointer, the amount of something; face of a... more The face of a WATCH or CLOCK. The clockwise face of an instrument for indicating, as by a moving pointer, the amount of something; face of a COMPASS, GAUGE or METER. A SUNDIAL.
	1354	diaphone	A device operated by compressed air for producing a distinctive FOG SIGNAL.
	1355	diaphragm	In a TELESCOPE, a thin glass disk on which etched lines forming a RETICLE are placed. See also RETICLE, and APERTURE STOP.
	1356	diapositive	A positive PHOTOGRAPH on a transparent medium. One which has a right reading image when viewed through the base support.
	1357	difference: tidal	See TIDAL DIFFERENCE.
	1358	difference of latitude	The ANGULAR DISTANCE between the PARALLELS of two places measured on a MERIDIAN.
	1359	difference of longitude	The angle at the POLE or intercepted arc of EQUATOR between the MERIDIANS of two places.
	1360	differential GPS	Differential GPS is implemented by placing a GPS monitor receiver at a precisely known location. Instead of computing a navigation fix, the ... more Differential GPS is implemented by placing a GPS monitor receiver at a precisely known location. Instead of computing a navigation fix, the monitor determines the range error to every GPS satellite it can track. These ranging errors are then transmitted to local users where they are applied as corrections before computing the navigation result.
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