Garmin AERA 660 Pilot's Manual page 191

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
190-02017-20 Rev. A
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 660 Pilot's Guide
Appendix J
175