Garmin aera 560 Pilot's Manual page 217

FSS
ft
gal
Glide Ratio, G/R
gph
GPS
Grid MORA
Ground-Based
Transceiver
Groundspeed
Ground Track
GS
Heading
Hg
hPa
hr
HSI
Hz
IAF
IAT
ICAO
IFR
190-01117-02 Rev. C
Flight Service Station
foot/feet
gallon(s)
The estimated distance an aircraft will move forward for any
given amount of lost altitude.
gallons per hour
Global Positioning System
Grid Minimum Off-Route Altitude; one degree latitude by
one degree longitude in size and clears the highest elevation
reference point in the grid by 1000 feet for all areas of the
grid
Provides ADS-R, TIS-B and FIS-B broadcasts to ADS-B
participating aircraft.
The velocity that the aircraft is travelling relative to a ground
position.
see Track
Ground speed
The direction an aircraft is pointed, based upon indications
from a magnetic compass or a properly set directional gyro.
mercury
hectopascal
hour
Horizontal Situation Indicator
Hertz
Initial Approach Fix
Indicated Air Temperature
International Civil Aviation Organization
Instrument Flight Rules
Garmin aera 500 Series Pilot's Guide
Appendix J
201