MiGMan's Flight Sim Museum

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I

IAS

Indicated Air Speed

IFF

Identification Friend or Foe

IFR

Instrument Flight Rules, flying purely by reference to instruments.

ILS

Instrument Landing System

INS

Inertial Navigation System.
An onboar'd system which uses gyroscopes, (either mechanical or laser) to sense acceleration and deceleration and compute current position.The system needs a known starting point to be entered prior to flight.

IP

Initial Point

The location chosen to set up an attack run on a ground target

IR

lnfra Red