AGL General Aviation Instrument Landing System 
Flight Training Central
FEBRUARY 28, 2024
The Instrument Landing System (ILS) is a precision approach and provides both lateral and vertical guidance to a runway. For most general aviation operations, it allows a pilot to descend to as low as 200′ AGL and assist a pilot in locating the runway in as low as 3/8 mile visibility.
Pilot Institute
FEBRUARY 15, 2025
Theyre especially useful for airports that dont have the budget or suitable terrain to install an Instrument Landing System (ILS). This makes more airports accessible under Instrument Flight Rules (IFR). Theyre pretty much the same thing, but heres the difference: DH is measured above the ground (AGL).
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