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11 - MESSAGES
ABBREVIATIONS &
NAV TERMS
191
190-00356-00 Rev E
NATNL— National
NAV— Navigation
NAVAID— Navigational Aid
NDB— Non-DirectionalRadioBeacon
NM— Nautical Miles
NRST— Nearest
NUM— Number
OBS— Omnibearing Selector
OCN— Oceanic
PDA— PrematureDescentAlert
P.POS— Present Position
PROC— Procedure(s)
PROV— Province
PTK— Parallel Track
PWR— Power
RAD— Radial
RAIM— Receiver Autonomous Integrity Monitoring
REF— Reference
REQ— Required / Requirements
RESTRICTD— Restricted
RNG— Range
RTC— Required Terrain Clearance
RX— Receive
SBAS— Space-Based Augmentation System
SID— StandardInstrumentDeparture
Sml— Small
SPD— Speed
SQ— Squelch
SRFC— Surface
STAR—
Standard Terminal Arrival Route
SUA— Special Use Airspace
SUSP— Waypoint sequencing suspended
°T— DegreeTrue
TACAN— Tactical Air Navigation
TAS— True Airspeed
TAT— Total Air Temperature
TEMP— Temperature
TER— Terrain
TERM— Terminal
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— VerticalAlarmLimit
VAR— Variation
VER— Version