I'm infamous for "Forgetting" stuff, it has become a part of my personna I guess. The whole thing of this boils down to learning as much as we can about all of the tools available and using them to the best of our ability. If you own a map a compass and a GPS, take them all with you and above all, become familiar with them and use them all of the time. There should be no excuse for having to CHOOSE between a compass or the GPS, if you own both, carry both. They are both lighweight, (relatively) inexpensive and don't take up much space. Anybody that would "Choose" between these two items is just plain lazy.
You are only "Lost" if you have to be someplace at a particular time and there are others expecting you to be there at that time. Beyond that, you, personally, may be inconvenienced at times but as long as it is not life threatening it is no big deal.