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GMC
GMC Ground movement control, or controller.
GMCS Ground-manoeuvring camera system.
GMD Ground-based midcourse defense; S adds
segment or system; in 2002 this replaced NIM as planned
national defence against ballistic missiles (US).
GMDSS Global maritime distress and safety system[s].
GMES Global monitoring for [or of] environment and
security [EC + ESA] (2008-).
GMFSC Ground mobile forces satellite communications.
GMI Goddard management instruction.
GML Gross moving load.
GMLA Guided missiles and launch assemblies.
GMLRS Guided multi-launch rocket system.
GMLS Guided-missile launch system.
GMLTS Guided-missile launcher test set.
GM-1 Nitrous oxide, piston-engine boost system (G,
WW2).
GMP Ground-movement planning.
GMR 1 Ground-mapping radar.
2 Giant magnetoresistance.
GMRP Guided-missile round pack.
GMS 1 Geostationary meteorological satellite.
2 Groupement des Missiles Stratégiques (F).
3 Ground-based midcourse system.
4 Ground monitoring station.
GMSP Global multi-mission support platform.
GMT Greenwich mean time, or Zulu, now replaced by
UTC.
GMTI Ground moving-target indicator (or indication).
GMTT Ground moving target tracking.
GMU GPS-based measuring, or monitoring, unit.
GMVLS Guided-missile vertical launch system.
GN See GN 2 .
Gn Green.
g n Standard value for gravitational acceleration.
GNA Global network architecture.
GN&C Guidance, navigation and control.
G-nav Navigation direct from A to B not on promulgated
airway but crossing radials yet still using
VOR/DME; name from graphic navigation, using
computer-produced charts or hand-held equipment to
give pilot a picture derived from VOR/DME inputs. Basic
method of cross-radial navigation.
GNC 1 Graphic numerical control.
2 General navigation computer.
3 Global navigation chart.
GNCS Guidance navigation control system.
GND, gnd Ground [CK adds check, CON control, FG
fog].
GNE 1 Gross navigational error.
2 Global distribution system new entrants (Int.).
GNLS GPS navigation and landing system.
GNLU GPS navigation and landing unit.
GNN Government News Net (UK).
gnomonic projection Created by projecting from centre
of Earth surface features on plane tangent to surface;
distortion severe except near origin (point where plane
touches Earth) but great circles are straight lines.
GNR Global navigation receiver.
GNS 1 Global navigation system.
2 Global navigation satellite [P adds panel, S system,
SA supervisory authority, SP system panel, SU sensor
unit]; general term for all such spacecraft.
Goldstein
3 Glassfibre/Nomex sandwich.
GNT Gross nozzle thrust.
GN 2 Gaseous nitrogen.
GNY German navy [UK usage].
GO 1 Geared, opposed (US piston-engine designation).
2 General Order (military).
3 Groupe d’Observation (F).
GO 2 Gaseous oxygen.
go-ahead Point in government programme at which
prime contractor receives written authorization to
proceed with full-scale development. Not an official term.
go-around Overshoot; see going around.
go-around mode Terminates aircraft approach and
commands climb; also known as auto overshoot.
GOC Generator over-current.
GOCE Gravity-field and steady-state ocean explorer.
Goco, GOCO Government owned, contractoroperated
(US).
GODAE Global ocean data assimilation experiment.
Goddard Space Flight Center Greenbelt, Maryland,
centre for NASA tracking and communications network.
Godsave See GHA.
Goes, GOES 1 Geostationary, or geosynchronousorbit,
or global, operational environmental satellite,
suffixes East or West.
2 Gyrostabilized opto-electronic system.
go for broke To fire all weapons in one pass of target.
go gauge Dimensional gauge which must fit close, but
without being forced, on or in the part for which it is
intended.
go-home mode Emergency RPV flight-control mode
used following loss of navigation or command link.
going around: 1 Overshoot straight ahead (UK civil).
2 Make another cirscuit (RAF).
Gold General on-line diagnostic.
gold Au, malleable metal with density 19.3, MPt
1,064°C, aerospace use mainly thermal-reflective coatings.
goldbeaters’ fabric Layer of cloth fabric cemented to one
or more layers of goldbeaters’ skin, making it gastight.
Gold C Gliding certificate second only to Diamond C,
requiring flight of 300 km and other achievements.
golden arm Supposed attribute of pilot whose ability
and experience master all simulations and are acknowledged
by peers.
golden handcuffs Large cash sum to induce military pilot
to extend period of service (UK, colloq.).
gold film Extremely thin vapour-deposited electrically
conductive film used for thermal anti-icing of transparencies.
Goldfish Club Club open to aircrew whose lives have
been saved by dinghy made by UK company RFD Ltd.
(1940-).
goldie Verbal code: “Aircraft automatic flight-control
system and ground-control bombing system are engaged
and awaiting electronic ground commands” (DoD).
goldie lock Verbal code: “Ground controller has electronic
control of aircraft” (DoD).
gold plating Introduction of what (generally ignorant or
partisan) politicians claim to be costly and unnecessary
features in weapon systems (US).
Goldstein In 1929 put forward two theories to simplify
propeller calculations: the trailed vortex sheet is a helix of
constant pitch; and the resultant velocity is the vector sum
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