Actually it is! The ATPL/CPL theory teaches and examines GPS systems in reasonable detail
??? Are we talking about the JAA ATPLs? Perhaps for
very general values of "reasonable details" that could be true, as in: "There is something called GPS which stands for Global Positioning System. It has to do with satellites". But the ATPLs go in more detail about EFIS and FMCs for example, than they do about GPS. Go to your favourite question bank and do a search for the relevant terms to get an idea.
Chuck,
there have been many times in the past I was not anywhere near 100% sure of exactly where I was
That's never happened to me. I've always had an
accurate idea of where I was--perhaps not an overly
precise idea, but I can honestly say I never found myself flying in the wrong hemisphere by mistake, and only ever once in the wrong continent. Lots of times in the wrong country, mind you