navigation acronyms, abbreviations and definitions - International ...

V2X (also V2I) vehicle-to-infrastructure (part of CVIS)
VA volcanic ash (met)
VAAC Volcanic Ash Advisory Centre
Provides reports and forecasts of volcanic ash plumes.
VADR voice and data recorder (aircraft)
VAFORIT Very Advanced Flight Data Processing OR Implementation System
German DFS contract.
VAL vertical alert limit/level (eg for WAAS precision approach etc)
VAMS Virtual Airspace Modeling and Simulation (NASA/Boeing ATC
VANESSA Validation and ANalysis of EGNOS Signal within Swiss Airspace
Var variation
Angle between TN and MN, from TN eastwards named E (+),
westwards named W (-).
VAS value-added service
VASIS Visual Approach Slope Indicator System
VASP value-added service provider
VBA vibrating beam accelerometer (for MEMS IMU)
VBM Variable Butler Matrix (phase-shifters and amps, eg for jamming sim)
VBS virtual base station
VC in vacinity (met)
VCA Vehicle Certification Agency (for EMC of vehicles)
VCASS Visualisation-based Collision Avoidance Support System
VCR visual control room (ATC)
VCS voice communications system (ATC)
VDB VHF data broadcast
VDF VHF direction finding
VDL VHF Digital Link (ARINC)
Civil air data link for air-to-ground business and ATS messages. VDL-2
in service in 2001. VDL-3 (TDMA) by about 2007. VDL-4 is latest
proposal at 19,200 baud.
VDOP vertical dilution of precision
The factor by which the one-dimensional vertical accuracy of a fix is
degraded by geometrical considerations.
VDP visual descent point
VDR voyage data recorder
vertical circle Great circle of the celestial sphere throught the zenith & nadir
VEX Vertical Expansion (programme - eg coverage of 8.33 kHz channels)
VFR visit friends or relatives’ - category of air travel
VFR visual flight rules
VGA Standard display format of 640 x 480 pixels
VGS VHF ground station
VGS visual guidance system
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