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Pilot/Controller Glossary

VISUAL HOLDING

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 The holding of aircraft at selected, prominent geographical fixes
which can be easily

recognized from the air.

(See HOLDING FIX.)

VISUAL LINE OF SIGHT (VLOS)

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 Condition of operations wherein the operator maintains continuous,

unaided visual contact with the unmanned aircraft.
VISUAL METEOROLOGICAL CONDITIONS

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 Meteorological conditions expressed in terms of visibility,

distance from cloud, and ceiling equal to or better than specified
minima.

(See INSTRUMENT FLIGHT RULES.)
(See INSTRUMENT METEOROLOGICAL CONDITIONS.)
(See VISUAL FLIGHT RULES.)

VISUAL OBSERVER (VO)

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 A person who is designated by the remote pilot in command to assist
the remote

pilot in command and the person operating the flight controls of the
small UAS (sUAS) to see and avoid other

air traffic or objects aloft or on the ground.
VISUAL SEGMENT

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(See PUBLISHED INSTRUMENT APPROACH PROCEDURE VISUAL SEGMENT.)

VISUAL SEPARATION

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 A means employed by ATC to separate aircraft in terminal areas and en
route airspace

in the NAS. There are two ways to effect this separation:

a.

The tower controller sees the aircraft involved and issues
instructions, as necessary, to ensure that the

aircraft avoid each other.

b.

A pilot sees the other aircraft involved and upon instructions from the
controller provides his/her own

separation by maneuvering his/her aircraft as necessary to avoid it.
This may involve following another aircraft

or keeping it in sight until it is no longer a factor.

(See SEE AND AVOID.)
(Refer to 14 CFR Part 91.)

VLF

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(See VERY LOW FREQUENCY.)

VMC

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(See VISUAL METEOROLOGICAL CONDITIONS.)

VOICE SWITCHING AND CONTROL SYSTEM (VSCS)

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 A computer controlled switching system that

provides air traffic controllers with all voice circuits (air to ground
and ground to ground) necessary for air traffic

control.

(Refer to AIM.)

VOR

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 A ground-based electronic navigation aid transmitting very high
frequency navigation signals, 360

degrees in azimuth, oriented from magnetic north. Used as
the basis for navigation in the National Airspace

System. The VOR periodically identifies itself by Morse Code and may
have an additional voice identification

feature. Voice features may be used by ATC or FSS for transmitting
instructions/information to pilots.

(See NAVIGATIONAL AID.)
(Refer to AIM.)

VOR TEST SIGNAL

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(See VOT.)

VORTAC

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 A navigation aid providing VOR azimuth,
TACAN azimuth, and TACAN distance measuring

equipment (DME) at one site.

(See DISTANCE MEASURING EQUIPMENT.)
(See NAVIGATIONAL AID.)
(See TACAN.)
(See VOR.)
(Refer to AIM.)

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