433 abbreviations
Abbreviation Meaning
GLU GPS landing unit
GMT Greenwich Mean Time
GND Ground
GNSS Global Navigation Satellite System
GO Go Around
GPS Global Positioning System
GPWC Ground proximity warning computer
GPWS Ground proximity warning system
GS Glide Slope
HDG Heading
HDG SEL Heading select
HDOP Horizontal dilution of precision
HF High frequency
"Hg Inch of Mercury
HHLD Heading hold
HIRF High intensity radiated field
HMD Helmet-mounted display
HPR High Pressure Rotor
HSD High-speed data
HSI Horizontal situation indicator
HSL Heading select
HUD Head-up display
Hz Hertz
IAS Indicated airspeed
ID Identify/Identification or identifier
IDENT Identify/identifier
IDS Information display system or integrated display system
IFE In-flight entertainment
IFF Identification Friend or Foe
IFR Instrument Flight Rules
ILS Instrument landing system
IMC Instrument meteorological conditions
IND Indicator
InHg Inch of Mercury
INS Inertial Navigation System
IRS Inertial Reference System
ISA International Standard Atmosphere
ISP Integrated switching panel
ITT Interstage turbine temperature
IVSI Instantaneous vertical speed indicator
JTIDS Joint Tactical Information Distribution System
LAAS Local Area Augmentation System
LADGPS Local Area Differential GPS
LCD Liquid crystal display
LDGPS Local area differential global positioning satellite
LED Light-emitting diode
LMM Locator middle marker
LOC Localizer
LOM Locator outer marker
LORAN Long-range navigation