ADF

Automatic Direction Finder

AGL

Above Ground Level (for Altitude and Elevation)

AIRAC

Regular publication known as Aeronautical Information Regulation And Control

ATC

 Air Traffic Control

CAS

Calibrated AirSpeed

CDI

Course Deviation Indicator

CH

Compass Heading

DME

Distance Measuring Equipment

FL

Flight Level

FSX

Flight Simulator X = Latest flight simulator from Microsoft

FSX-SE

Flight Simulator X Steam edition 

GPS

Global Positioning System

GS

Ground Speed

hPa

HectoPascal (SI unit of pressure)

IAS

Indicated AirSpeed

IFR

Instrument Flight Rules

ILS

Instrument Landing System

inHg

Inches of mercury (US unit of pressure)

KTAS

Knots True Airspeed

kts

Knots

LOC

Localizer

mbar

Old [not SI] unit of atmospheric air pressure

MH

Magnetic Heading

MSL

Mean Sea Level (for Altitude and Elevation)

NDB

Non-Directional Beacon

NM

Nautical Mile

P3D

Prepar3d = flight simulator licensed by Lockheed Martin

QFE

Q code used by pilots and air traffic controllers that refers to atmospheric pressure and altimeter settings - shown in EFIS panel

QNH  

Q code used by pilots and air traffic controllers that refers to barometric pressure adjusted to sea level - shown in EFIS panel

SID

Standard Instrument Departure

Simconnect

Interface program to communicate with FSX or P3D

STAR

Standard Arrival Route

TAS

True Air Speed

TH

True Heading

VFR

Visual Flight Rules

VOR

VHF (very high frequency) Omnidirectional Radio Range












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