Garmin GPS 150 Pilot's Manual page 61

The following SUA types can appear in the SUA type field:
Message Airspace Type
alrt - Alert
caut - Caution
cl B - Class B
cl C - Class C
cta - ICAO Control Area
dngr - Danger
moa - Military Operations Area
proh - Prohibited
rstc - Restricted
tma - ICAO Terminal Control Area
trng - Training
trsa - Terminal Radar Service Area
unsp - Unspecified
warn - Warning
The SUA name is displayed on the center line initially and the controlling agency
can be viewed by rotating K. You may also view SUA controlling agency communication
frequencies by highlighting the controlling airport identifier with the cursor and pressing
E. The following are examples of what can appear in the altitude fields:
Message Meaning
8000 f tM
- 8000 feet mean sea level (MSL)
3000 f tA
- 3000 feet above ground level (AGL)
ground - ground level
msl - mean sea level
- See Notice to Airmen (NOTAM)
notam
for altitude restrictions
not sp - Altitude is not specified
unlmtd
- Altitude is unlimited
REFERENCE
SUA Information
SUA Alert page
Frequency information for SUA.
Section
4
51