Abbreviation/ Meaning
Acronym
VMINI . . . . . . Instrument flight minimum speed, utilized
in complying with minimum limit speed
requirements for instrument flight

VNAV . . . . . . Vertical Navigation
VNE . . . . . . . Never exceed speed
VNEI . . . . . . . Instrument flight never exceed speed,
utilized instead of VNE for compliance with
maximum limit speed requirements for
instrument flight
VOR . . . . . . . Very High Frequency Omni-directional
Range
VORTAC . . . VHF Omni-directional Range/Tactical Air
Navigation
VOT . . . . . . . VOR Test Facility
VR . . . . . . . . VFR Military Training Route
VREF . . . . . . . The reference landing approach speed,
usually about 1.3 times Vso plus 50 percent
of the wind gust speed in excess of the

mean wind speed.

VSO . . . . . . . . The stalling speed or the minimum steady
flight speed in the landing configuration at
maximum weight.
VTF . . . . . . . Vector to Final
VV . . . . . . . . Vertical Visibility

Abbreviation/ Meaning
Acronym
VVI . . . . . . . Vertical Velocity Indicator
VY . . . . . . . . Speed for best rate of climb

VYI . . . . . . . . Instrument climb speed, utilized instead of
VY for compliance with the climb
requirements for instrument flight
WA . . . . . . . . AIRMET
WAAS . . . . . Wide Area Augmentation System

WFO . . . . . . . Weather Forecast Office
WGS-84 . . . . World Geodetic System of 1984
WMO . . . . . . World Meteorological Organization
WMS . . Wide-Area Master Station
WMSC . . . . . Weather Message Switching Center
WMSCR . . . . Weather Message Switching Center
Replacement
WP . . . . . . . . Waypoint
WRS . . . . . . . Wide-Area Ground Reference Station

WS . . . . . . . . SIGMET

WSO . . . . . . Weather Service Office

WSP . . . . . . . Weather System Processor
WST . . . . . . . Convective Significant Meteorological
Information
WW . . . . . . . Severe Weather Watch Bulletin