Garmin GPS 400 Pilot's Manual And Reference page 155

RAD
— Radial
RAIM
— Receiver Autonomous Integrity
Monitoring
REF
Reference
—
REQ
— Required / Requirements
RESTRICTD
—Restricted
RNG
— Range
RX
— Receive
SID
— Standard Instrument Departure
Sml
Small
—
SPD
— Speed
SQ
— Squelch
SRFC
— Surface
STAR
— Standard Terminal Arrival Route
SUA
— Special Use Airspace
°T
Degree True
—
TACAN
— Tactical Air Navigation
TAS
— True Airspeed
TAT
— Total Air Temperature
TEMP
— Temperature
TERM
— Terminal
TKE
Track Angle Error
—
TMA
— ICAO Terminal Control Area
TRANS
— Transition
TRK
— Track (also Ground Track)
TRSA
— Terminal Radar Service Area
twr
— Tower
TX
— Transmit
uni
— Unicom
UTC
— Coordinated Universal Time
(also GMT or "zulu")
VAR
— Variation
VER
— Version
VFR
— Visual Flight Rules
VNAV
— Vertical Navigation
VOL
Volume
—
VOR
— VHF Omnidirectional Radio
Range
VS
— Vertical Speed
VSR
— Vertical Speed Required
MESSAGES,
aBBREVIATIONS
& nav tERMS
WPT
— Waypoint
WX
Weather
—
XTK
— Crosstrack Error
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