Altimeter Instrument Flight Rules Primary Flight Display 
Professional Pilot
APRIL 3, 2025
Under visual flight rules (VFR) during daytime, a pilot can operate with only basic gauges: an airspeed indicator, altimeter, compass, fuel gauges for each tank, and oil temperature, pressure, and engine RPM readings. Beyond the basics, IFR requires a gyroscopic attitude indicator, radio, and clock.
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). Otherwise, the airport would have to suspend flight operations in poor visibility. Cross-check your instruments.
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