Garmin GPS 175 Pilot's Manual page 215

GRS Garmin Reference System
GS Glideslope
GSL Geometric Sea Level
GSU Garmin Sensing Unit
GTP Garmin Temperature Probe
H
HDG Heading
HOT Hazardous Obstacle Transmission
HPL Horizontal Protection Level
HSDB High Speed Data Bus
I
IAF Initial Approach Fix
IAS Indicated Airspeed
IAT Induction Air Temperature
IFR Instrument Flight Rules
IGRF International Geomagnetic Reference Field
ILI Imminent Line Impact
ILS Instrument Landing System
INT Intersection
IOI Imminent Obstacle Impact
ISA International Standard Atmosphere
ITI Imminent Terrain Impact
K
KIAS Knots Indicated Airspeed
L
LDI Lateral Deviation Indicator
LOA Letter of Authorization
LOC Localizer
LRU Line Replaceable Unit
190-02207-02 Rev. 1 GPS 175/GNX 375 Pilot's Guide
Glossary
8-3