In commercial aircraft
for civil purposes
APDD is intended for operation with ground local control-corrective station in VHF range. APDD on it parameters meets the requirements of ICAO, Annex 10, Chapter 3, change 76 and document `Specifications to airborne aviation equipment of differential subsystem GNSS`. APDD issues to users the digital differential corrections of the pseudoranges of satellite constellations GPS and GLONASS and also another information for supporting of the accurate approach procedures. APDD has a wide built in control device, allowing to test the receiver directly on the aircraft. APDD is controlled by digital signals from control centralized facilities
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