In article , Mick
Ruthven wrote:

Unless I'm missing someting here, an IFR approved GPS receiver (GPS only,
not a combination GPS, VOR, LOC unit like some of the newer ones) like the
KLN 89B will contain GPS approaches in the database. To fly VOR-only or LOC
or ILS or NDB approaches you need to use the avionics for those approaches,
not a GPS.

It depends on the box and the installation.
It may only be certified for enroute.
It may be certified for enroute and terminal.
It may be certified for enroute, terminal and approach.