For specific flight into designated airspace or the use of specific procedures like SID, STAR, LPV approach, RNAV 1, there are minimum equipment requirements where a database is used to describe the flight path. Those need to be provided by a certified DAT provider.
However, there could be another scenario where the GPS is not used as primary navigation, e.g. in a pure VFR environment. Consequently, the database fed into the GPS could be provided by ‘non-certified’ DAT provider. In this latter case, the GPS database is excluded. The intention was to allow the use of tools in support of the VFR only certified aircraft while demanding oversight for databases used for mandatory navigation functions.