This is not an approved use of the GPS equipment. VOR approaches are
supposed to be flown using actual VOR course guidance, or as a GPS overlay
approach. The latter must be loaded from the database because there are
operational consequences when you do it that way. Substitution of GPS for
ground-based navaids in the approach phase is limited to DME and ADF.

On the KLN 94, if you do not keep the database updated, the box will
not allow you to select any approaches from the database.