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of properly equipped users. The system is unaffected
by weather, and provides a worldwide common grid
reference system. The GPS concept is predicated
upon accurate and continuous knowledge of the
spatial position of each satellite in the system with
respect to time and distance from a transmitting
satellite to the user. The GPS receiver automatically
selects appropriate signals from the satellites in view
and translates these into three-dimensional position,
velocity, and time. System accuracy for civil users is
normally 100 meters horizontally.
GO AHEAD− Proceed with your message. Not to be
used for any other purpose.
GO AROUND− Instructions for a pilot to abandon
his/her approach to landing. Additional instructions
may follow. Unless otherwise advised by ATC, a
VFR aircraft or an aircraft conducting visual approach
should overfly the runway while climbing to
traffic pattern altitude and enter the traffic pattern via
the crosswind leg. A pilot on an IFR flight plan
making an instrument approach should execute the
Pilot/Controller Glossary 8/5/04
PCG G−2
published missed approach procedure or proceed as
instructed by ATC; e.g., “Go around” (additional
instructions if required).
(See LOW APPROACH.)
(See MISSED APPROACH.)
GPD−
(See GRAPHIC PLAN DISPLAY.)
GPS−
(See GLOBAL POSITIONING SYSTEM.)
GRAPHIC PLAN DISPLAY (GPD)− A view available
with URET that provides a graphic display of
aircraft, traffic, and notification of predicted conflicts.
Graphic routes for Current Plans and Trial
Plans are displayed upon controller request.
(See USER REQUEST EVALUATION TOOL.)
GROUND−BASED TRANSCEIVER (GBT)− The
ground−based transmitter/receiver (transceiver) receives
automatic dependent surveillance−broadcast
messages, which are forwarded to an air traffic
control facility for processing and display with other
radar targets on the plan position indicator (radar
display).
(See AUTOMATIC DEPENDENT
SURVEILLANCE-BROADCAST.)
GROUND CLUTTER− A pattern produced on the
radar scope by ground returns which may degrade
other radar returns in the affected area. The effect of
ground clutter is minimized by the use of moving
target indicator (MTI) circuits in the radar equipment
resulting in a radar presentation which displays only
targets which are in motion.
(See CLUTTER.)
GROUND COMMUNICATION OUTLET (GCO)−
An unstaffed, remotely controlled, ground/ground
communications facility. Pilots at uncontrolled airports
may contact ATC and FSS via VHF to a
telephone connection to obtain an instrument clearance
or close a VFR or IFR flight plan. They may also
get an updated weather briefing prior to takeoff.
Pilots will use four “key clicks” on the VHF radio to
contact the appropriate ATC facility or six “key
clicks” to contact the FSS. The GCO system is
intended to be used only on the ground.
GROUND CONTROLLED APPROACH− A radar
approach system operated from the ground by air
traffic control personnel transmitting instructions to
the pilot by radio. The approach may be conducted
with surveillance radar (ASR) only or with both
surveillance and precision approach radar (PAR).
Usage of the term “GCA” by pilots is discouraged
except when referring to a GCA facility. Pilots should
specifically request a “PAR” approach when a
precision radar approach is desired or request an
“ASR” or “surveillance” approach when a nonprecision
radar approach is desired.
(See RADAR APPROACH.)
GROUND DELAY PROGRAM (GDP)− A traffic
management process administered by the ATCSCC;
when aircraft are held on the ground. The purpose of
the program is to support the TM mission and limit
airborne holding. It is a flexible program and may be
implemented in various forms depending upon the
needs of the AT system. Ground delay programs
provide for equitable assignment of delays to all
system users.
GROUND SPEED− The speed of an aircraft relative
to the surface of the earth.
GROUND STOP (GS)− The GS is a process that
requires aircraft that meet a specific criteria to remain
on the ground. The criteria may be airport specific,
airspace specific, or equipment specific; for example,
all departures to San Francisco, or all departures
entering Yorktown sector, or all Category I and II
aircraft going to Charlotte. GSs normally occur with
little or no warning.
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