Instrument Flight Rules Threshold VOR 
Pilot Institute
JUNE 19, 2025
Visual Runways Visual runways have no instrument approach procedure available. On runways used by international commercial flights, a threshold must be present (we’ll look into that later in this article). Non-precision runways often look similar to visual runways but feature threshold and aiming point markings.
Pilot Institute
FEBRUARY 15, 2025
Before RNAV, pilots had to rely on radios (NAVAIDs) and antennas on the ground such as VORs (Very High-Frequency Omnidirectional Range) and NDBs (Non-Directional Beacons). Theyre especially useful for airports that dont have the budget or suitable terrain to install an Instrument Landing System (ILS).
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