Definition of this datum for the GIS packages and GPS receivers
Page maintained by Gábor TIMÁR & Gábor MOLNÁR
Space Research Group, Eötvös University of Hungary
Hungarian Datum 1972 (HD72) has been established as the geodetic base of the Hungarian EOV (Unified National Projection) grid. Its classic geodetic definition can be found at
the mirror of the official description directory.
This kind of data is not suitable for GIS and GPS (User Datum) purposes. As the datum transformation parameters between the HD72 and the WGS84 have been published incorrectly several times (and the incorrect numbers have been mirrored on many-many websites) we summarize them correctly here.