Source - Vi.potsdam.ny.us - Potsdam

VISUAL OMNIRANGE RECEIVER (VOR) - A unit designed to receive very high frequency
(VHF) omnidirectional radio navigational aids.
VISUAL RUNWAY - A visual runway is a runway intended solely for the operation of aircraft
using visual approach procedures.
VOR - Very High Frequency Omnirange Station. A ground-based radio (electronic) navigation aid
transmitting radials in all directions in the VHF frequency spectrum; provides azimuth guidance to
pilots by reception of electronic signals.
-W-
WIND-CONE (WIND SOCK) - Conical wind direction indicator.
WIND COVERAGE - Wind coverage is the percent of time for which aeronautical operations are
considered safe due to acceptable crosswind components.
-Y-
YEARLY DAY-NIGHT AVERAGE SOUND LEVEL (Ldn) - The 24-hour average sound levels, in
decibels, for the period from midnight to midnight, obtained after the addition of ten decibels to
sound levels for the periods between 10 p.m. and 7 a.m. the following day, averaged over a span of
one year.
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