Garmin GNS 530W Pilot's Manual & Reference page 212

12 - MESSAGES
ABBREVIATIONS &
NAV TERMS
TKE — Track Angle Error
TMA — ICAO Terminal Control Area
TRANS — Transition
TRFC — Traffic
TRK — Track (also Ground Track) Angle
TRSA — Terminal Radar Service Area
twr — Tower
TX — Transmit
uni — Unicom
UTC —
Coordinated Universal Time (also
GMT or "zulu")
UTM/UPS — Universal Transverse Mercator /
Universal Polar Stereographic grids
VAL — Vertical Alarm Limit
VAR —
Variation
VER — Version
VFOM — Vertical Figure of Merit
VFR — Visual Flight Rules
VLOC — VOR/Localizer Receiver
VNAV — Vertical Navigation
VOL — Volume
VOR — VHF Omnidirectional Radio Range
VPL —
Vertical Protection Level
VS — Vertical Speed
VSR — Vertical Speed Required
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WAAS —
Wide Area Augmentation System
WPT — Waypoint
WX — Weather
XTK — Crosstrack Error