GPS isn't on the PPL syllabus in the States but GPS use is widespread in GA. I don't think GPS is required to fly an airplane safely so no need to have it in the PPL which already cuts corners in order to get people through before they get bored of being a student. GPS are so easy to use you can pick it up yourself, as evidenced by the lack of formal teaching in the States. What the UK needs is for the CAA to embrace GPS technology and its use in the GA environment. GPS has been proven to be safe, extremely accurate and extremely useful in the US. The CAA needs to allow pilots to use GPS as they see fit, then pilots can decide whether they use it or not.