Instructors generally teach the use of ADF/VOR with reference to tune/identify/test but when it comes to GPS there is nothing similar that is tought universally. Instructors themselves often need to be tought how to use a GPS themselves so they can then teach it.
If you do a flight plan the conventional way using map, ruler and set square, and then program the GPS cross referencing the tracks and distances of each leg on the flight plan, you will find the GPS to be more reliable than any other form of nav. If you divert in flight using the GPS, you must check the Lat/Longs of any waypoint you divert to. This i most inportant in GA aircraft as theyn often have GPS whose waypoints can be altered by the user.
Having said all that, it is good to see instructors are still teaching map reading as it is an essential skill to have when all else fails.(Provided you have your WAC with you!)
