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Pilot/Controller Glossary

3/29/18

PCG G−2

GNSS MEA−

(See GLOBAL NAVIGATION SATELLITE

SYSTEM MINIMUM EN ROUTE IFR

ALTITUDE.)

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

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 EDST 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 EN ROUTE DECISION SUPPORT TOOL.)

GROSS NAVIGATION ERROR (GNE) − A lateral

deviation from a cleared track, normally in excess of

25 Nautical Miles (NM).  More stringent standards

(for example, 10NM in some parts of the North

Atlantic region) may be used in certain regions to

support reductions in lateral separation.

GROUND BASED AUGMENTATION SYSTEM

(GBAS)– A ground based GNSS station which

provides local differential corrections, integrity

parameters and approach data via VHF data broadcast

to GNSS users to meet real-time performance

requirements for CAT I precision approaches. The

aircraft applies the broadcast data to improve the

accuracy and integrity of its GNSS signals and

computes the deviations to the selected approach.  A

single ground station can serve multiple runway ends

up to an approximate radius of 23 NM. 

GROUND BASED AUGMENTATION SYSTEM

(GBAS) LANDING SYSTEM (GLS)- A type of

precision IAP based on local augmentation of GNSS

data using a single GBAS station to transmit locally

corrected GNSS data, integrity parameters and

approach information. This improves the accuracy of

aircraft GNSS receivers’ signal in space, enabling the

pilot to fly a precision approach with much greater

flexibility, reliability and complexity. The GLS

procedure is published on standard IAP charts,

features the title GLS with the designated runway and

minima as low as 200 feet DA. Future plans are

expected to support Cat II and CAT III operations.
GROUND−BASED TRANSCEIVER (GBT)− The

ground−based  transmitter/receiver (transceiver) re-

ceives 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