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‘Non-WAAS’ GPS units with vertical guidance for single engine and light twin airplanes

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Instrument Rating

Are ‘non-WAAS’ GPS units with approach vertical guidance typically installed in single engine or light twin airplanes or can these units only be found in larger airplanes? I am specifically referring to units that can be used for flying  LNAV/VNAV approaches (but not an LPV approaches).

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1 Answers



  1. John D Collins on Oct 25, 2016

    The system you are describing is called Baro-VNAV. It is uncommon in piston aircraft. Some G1000 installations support this capability and there is at least one manufacturer that provides such a system for light piston aircraft. Most aircraft that have this capability have a FMS and are turbojet or turboprop.

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