(2)
The clearance will result in noise abatement benefits where part of the IFR departure route does not conform to a Federal Aviation Administration approved noise abatement route or altitude.

(3)
A pilot has requested a practice instrument approach and is not on an IFR flight plan.

(4)
All pilots receiving this authorization must comply with the VFR visibility and distance from cloud criteria in Federal

Air Regulations Part 91. Use of the term does not relieve controllers of their responsibility to separate aircraft in Terminal Control Areas/Terminal Radar Service Areas as required by Federal Aviation Administration Handbook 7110.65. When used as an Air Traffic Control clearance/instruction, the term may be abbreviated "VFR," e.g., "Maintain VFR," "Climb/descend VFR," etc.
VFR ON TOP - Air Traffic Control authorization for an IFR aircraft to operate in VFR conditions at any appropriate VFR altitude (as specified in Federal Air Regulations and as restricted by Air Traffic Control). A pilot receiving this authorization must comply with the VFR visibility, distance from cloud criteria, and the minimum IFR altitudes specified in Federal Air Regulations Part 91. The use of this term does not relieve controllers of their responsibility to separate aircraft in Terminal Control Areas/Terminal Radar Service Areas as required by Federal Aviation Administration Handbook 7110.65.
VFR MILITARY TRAINING ROUTES/VR - 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 mean sea level at airspeeds in excess of 250 knots indicated airspeed.
VFR NOT RECOMMENDED - 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 forecasted weather conditions are at or below Visual Flight Rules minimums. It does not abrogate the pilot's authority to make his own decision.
VFR TOWER/NON-APPROACH CONTROL TOWER - (See Tower/Airport Traffic Control Tower)
VIDEO MAP - An electronically displayed map on the radar display that may depict data such as: airports, heliports, runway centerline extensions, hospital emergency landing areas, navigational aids and fixes, reporting points, airways/route centerlines, boundaries, handoff points, special use tracks, obstructions, prominent geographic features, map alignment indicators, range accuracy marks, minimum vectoring altitudes.
VISIBILITY (P/CG) - 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 statue miles, hundreds of feet or meters. (Refer to Federal Air Regulations Part 91)
(1)
FLIGHT VISIBILITY - 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.

(2)
GROUND VISIBILITY - Prevailing horizontal visibility near the earth's surface as reported by the United States National Weather Service or an accredited observer.

(3)
PREVAILING VISIBILITY - The greatest horizontal visibility equaled or exceeded throughout at least half the horizon circle which need not necessarily be continuous.

(4)
RUNWAY VISIBILITY VALUE/RVV - The visibility determined for a particular runway by a transmissometer. A meter provides a continuous indication of the visibility (reported in statue miles or fractions of statue mile) for the runway. RVV is used in lieu of prevailing visibility in determining minimums for a particular runway.

(5)
RUNWAY VISUAL RANGE/RVR - 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 on the measurement of a transmissometer made near the touchdown point of the instrument runway and is reported in hundreds of feet. RVR is used in lieu of Runway Visibility Value and/or prevailing visibility in determining minimums for a particular runway.
　
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