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	Eng ID	Term	Definition
	2101	gravity wave	See WAVE.
	2102	grease ice	A later stage of freezing than frazil ice when the crystals have coagulated to form a soupy layer on the surface. Grease ice reflects little... more A later stage of freezing than frazil ice when the crystals have coagulated to form a soupy layer on the surface. Grease ice reflects little light, giving the sea a matt appearance.
	2103	great circle	See CIRCLE.
	2104	great circle: primary	See PRIMARY GREAT CIRCLE.
	2105	great circle bearing	See BEARING.
	2106	great circle chart	See CHART: GNOMONIC.
	2107	great circle course	See COURSE.
	2108	great circle sailing	See SAILING.
	2109	great circle track	See TRACK.
	2110	great diurnal range	See RANGE: DIURNAL.
	2111	greatest elongation	See ELONGATION.
	2112	great tropic range	See RANGE.
	2113	Greenwich civil time	See TIME: GREENWICH MEAN.
	2114	Greenwich hour angle	See HOUR ANGLE.
	2115	Greenwich mean time (GMT)	See TIME.
	2116	Greenwich meridian	See MERIDIAN.
	2117	Greenwich time	See TIME.
	2118	grid	A series of lines, usually straight and parallel, superimposed on a CHART or PLOTTING SHEET to serve as a directional reference for NAVIGAT... more A series of lines, usually straight and parallel, superimposed on a CHART or PLOTTING SHEET to serve as a directional reference for NAVIGATION. See also GRATICULE. Two sets of mutually perpendicular lines dividing a MAP, CHART, or other representation of the EARTH's surface, into squares or rectangles to permit location of any point by a system of RECTANGULAR COORDINATES. In electronics, an electrode with one or more openings to permit passage of electrons or ions.
	2119	grid: parallactic	In PHOTOGRAMMETRY, a uniform pattern of rectangular lines drawn or engraved on some transparent material, usually glass, and placed either ... more In PHOTOGRAMMETRY, a uniform pattern of rectangular lines drawn or engraved on some transparent material, usually glass, and placed either over the PHOTOGRAPHS of a STEREOSCOPIC PAIR or in the OPTICAL SYSTEM of a STEREOSCOPE, in order to provide a continuous floating-mark system.
	2120	grid: perspective	In PHOTOGRAMMETRY, a network of lines, drawn or superimposed on a PHOTOGRAPH, to represent the perspective of a systematic network of lines... more In PHOTOGRAMMETRY, a network of lines, drawn or superimposed on a PHOTOGRAPH, to represent the perspective of a systematic network of lines on the GROUND or DATUM PLANE. See also GRID METHOD.
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