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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 IRO... 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.