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Pilot/Controller Glossary

Class B and Class C airspace or TRSAs as required by
FAA Order JO 7110.65. When used as an ATC

clearance/instruction, the term may be abbreviated "VFR;"
e.g., "MAINTAIN VFR," "CLIMB/DESCEND VFR,"

etc.

VFR FLIGHT

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(See VFR AIRCRAFT.)

VFR MILITARY TRAINING ROUTES (VR)

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 Routes used by the Department of Defense and associated

Reserve and Air Guard units for the purpose of conducting low-altitude
navigation and tactical training under

VFR below 10,000 feet MSL at airspeeds in excess of 250 knots IAS.

VFR NOT RECOMMENDED

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An advisory provided by a flight service station to a pilot during a
preflight

or inflight weather briefing that flight under visual flight rules is
not recommended. To be given when the current

and/or forecast weather conditions are at or below VFR minimums.
It does not abrogate the pilot's authority to

make his/her own decision.

VFR-ON-TOP

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 ATC authorization for an IFR aircraft to operate in VFR conditions at
any appropriate VFR

altitude (as specified in 14 CFR and as restricted by ATC). A pilot
receiving this authorization must comply with

the VFR visibility, distance from cloud criteria, and the minimum IFR
altitudes specified in 14 CFR Part 91.

The use of this term does not relieve controllers of their
responsibility to separate aircraft in Class B and Class

C airspace or TRSAs as required by FAA Order JO 7110.65.
VFR TERMINAL AREA CHARTS

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(See AERONAUTICAL CHART.)

VFR WAYPOINT

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(See WAYPOINT.)

VHF

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(See VERY HIGH FREQUENCY.)

VHF OMNIDIRECTIONAL RANGE/TACTICAL AIR NAVIGATION

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(See VORTAC.)

VIDEO MAP

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 An electronically displayed map on the radar display that may depict
data such as airports,

heliports, runway centerline extensions,
hospital emergency landing areas, NAVAIDs and fixes, reporting

points, airway/route centerlines, boundaries, handoff points, special
use tracks, obstructions, prominent

geographic features, map alignment indicators, range accuracy marks,
and/or minimum vectoring altitudes.
VISIBILITY

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The ability, as determined by atmospheric conditions and expressed in
units of distance, to see

and identify prominent unlighted objects by day and prominent lighted
objects by night. Visibility is reported

as statute miles, hundreds of feet or meters.

(Refer to 14 CFR Part 91.)
(Refer to AIM.)

a.

Flight Visibility

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 The average forward horizontal distance, from the cockpit of an
aircraft in flight, at which

prominent unlighted objects may be seen and identified by day and
prominent lighted objects may be seen and

identified by night.

b.

Ground Visibility

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 Prevailing horizontal visibility near the earth's surface as reported
by the United States

National Weather Service or an accredited observer.

c.

Prevailing Visibility

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 The greatest horizontal visibility equaled or exceeded throughout at
least half the

horizon circle which need not necessarily be continuous.

d.

Runway Visual Range (RVR)

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 An instrumentally derived value, based on standard calibrations, that

represents the horizontal distance a pilot will see down the runway
from the approach end. It is based on the

sighting of either high intensity runway lights or on the visual
contrast of other targets whichever yields the

greater visual range. RVR, in contrast to prevailing or runway
visibility, is based on what a pilot in a moving

aircraft should see looking down the runway. RVR is horizontal visual
range, not slant visual range. It is based

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