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Eng ID Term Definition
2061
Global Maritime Distress and Safety System (GMDSS)
The GMDSS is a global communications service based upon automated systems, both satellite based and terrestri­al, to provide di­stress alert... more
The GMDSS is a global communications service based upon automated systems, both satellite based and terrestri­al, to provide di­stress alerting and promulgation of MARITIME SAFETY INFORMA­TION for mariners.
2062
Global Navigation Satellite System (GNSS)
The standard generic term for satellite NAVIGATION systems ("satnav") that provide autonomous geo-spatial positioning with global coverage.... more
The standard generic term for satellite NAVIGATION systems ("satnav") that provide autonomous geo-spatial positioning with global coverage. As of 2011, GPS and GLONASS are the only operational systems with new systems (for example the E.U's Galileo and China's Beidou) expected by 2020.
2063
globe
The EARTH; the world. A spherical structure on whose surface is depicted the geographical configuration of the EARTH (terre­strial globe).
2064
GLONASS
A space-based, radio-positioning, NAVIGATION and time-transfer system operated by the Government of the Russian Federation. GLONASS to whic... more
A space-based, radio-positioning, NAVIGATION and time-transfer system operated by the Government of the Russian Federation. GLONASS to which differential corrections have been applied is known as Differential GLONASS (DGLONASS). See also GLOBAL NAVIGATION SATELLITE SYSTEM.
2065
gnomon
Any object the shadow of which serves as an indicator, as the SHADOW PIN of a SUN COMPASS.
2066
gnomonic chart
See CHART.
2067
gnomonic projection
See PROJECTION.
2068
GNSS
See GLOBAL NAVIGATION SATELLITE SYSTEM
2069
Gold slide
An adjustable attachment to a MERCURIAL BAROMETER for giving resul­tant of CORRECTIONS for INDEX ERROR, HEIGHT of instrument above SEA LEVEL... more
An adjustable attachment to a MERCURIAL BAROMETER for giving resul­tant of CORRECTIONS for INDEX ERROR, HEIGHT of instrument above SEA LEVEL, variation in GRAVITY due to LATITUDE, temperature. Invented by Col. E. Gold.
2070
gong buoy
See BUOY: SOUND.
2071
goniometer
An instrument for measuring angles. A pick-up coil which eliminates the necessity of having to rotate a radio direction finder antenna to de... more
An instrument for measuring angles. A pick-up coil which eliminates the necessity of having to rotate a radio direction finder antenna to determine direction.
2072
gorge
A narrow opening, between HILLS, usually with precipitous sides.
2073
grab
A kind of closing scoop or bucket used in dred­ging or for bringing up BOTTOM SAMPLES.
2074
grab sampling
A random mode of collecting samples.
2075
grad (or grade)
A unit of angle measurement, equal to the angle at the centre of a circle, subtended by one four-hundredth part of its circumference.
2076
grade
Rate of SLOPE or degree of INCLINATION, as a 2% grade. See also GRADIENT and GRAD.
2077
grade correction (tape)
See TAPE: GRADE CORRECTION.
2078
gradient
The change of any quantity with distance in any given direction. See PRESSURE GRADIENT, TEMPERA­TURE LAPSE RATE. The amount of SLOPE, INCLIN... more
The change of any quantity with distance in any given direction. See PRESSURE GRADIENT, TEMPERA­TURE LAPSE RATE. The amount of SLOPE, INCLINATION to the HORIZON­TAL, in road, railway, etc.
2079
gradient tints
See HYP­SOMETRIC TINTS.
2080
graduation
The placing of marks on an instrument or device to represent standard values thereon. Also the marks so placed. The division and sub­divisio... more
The placing of marks on an instrument or device to represent standard values thereon. Also the marks so placed. The division and sub­division of LATITUDE and LONGITU­DE shown on the borders of a CHART. See also SCALE.