Of course, the GPS is a legitimate aid to navigaion. USE ALL MEANS to navigate safely. Keep SITUATION AWARENESS going by understanding and practising the basics - TRACK & GS, DRIFT & HEADING, XWC, HWC, TWC etc.
Here are some extracts from GASCo Flight Safety Vol.44 No.3 autumn 2008:
This website is very much work-in-progress. Standby for further Practical Navigation and other exercises here soon.