navigation acronyms, abbreviations and definitions - International ...

TSS traffic separation scheme
Tsunami Wave generated by seismic activity, seismic sea wave
TT true track (actual path of (ship’s) movement relative to the earth)
TT&C telemetry, tracking and command(ing)
TTA time to alarm/alert
The time elapsed between the occurrence of a failure in a system and
its presentation to the user (after IMO). Maximum allowable time
between the appeaance of an error outside the protection limit at the
integrity monitor and the broadcast of the alarm (USCG).
TTC Telemetry & Telecommand Station (Galileo)
TTC telemetry, tracking & command/control
TTEC Transport Technology Ergonomics Centre (Loughborough University)
TTF time to fix
TTFF time to first fix
TTFU time to first use
TTG time to go
TTI Tourist and Traveller Information
TTPO Technology Transfer Programme Office (ESA)
TTS Tactical Tool Suite (GPS)
TTS Transport Telematic System
TUEM ATCOs’ union in EUROCONTROL
TUNE time component of the user navigation error
TVAC thermal-vacuum (testing, eg of satellite)
TVE total vertical error
TVOR terminal VOR (low-powered as an approach aid)
TWD true wind direction
TWDL two-way data link
TWG Transport Council Working Group (EU)
TWP Technical Work Programme (ICAO)
TWR tower (air traffic control tower)
TWS true wind speed
TWSTFT two-way satellite and time frequency transfer
TWTA traveling wave tube amplifier
Tx transmitter
TXC TransXChange
An XML schema for exchange of bus route & schedule data.
TXCO temperature-controlled crystal oscillator
TYRO beginner or novice (used in ATC in emergency situations)
U-TDOA Uplink-TDOA (to calc cellular phone positions from base stations)
UA unmanned aircraft
UAC Upper Air Control (Centre)
UACC Upper Air Control Centre
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March 2012