The basics of VFR navigation must be learned before use of GPS is taught. We have non-moving map Garmin GPS150 or GNC250 units in all our aircraft and PPL students should be able to read off their present position before flying their first solo visual navigation exercise. However, they are not taught to use the GPS to navigate at that stage; it is there for them to advise ATC of the lat/long or range/bearing from base if utterly lost.
GPS is an excellent aid if used as a VFR back-up to a line on a current CAA chart, but only if used in accordance with Safety Sense 25.