They actually do have a satellite picture of the park with areas of the park named and there are signs that correspond to the map. I've been going out there for 5 years and still get lost. It's pretty big. The naps are at the house where you pay, seems they are only a few bucks and they can be helpful. Like you, I also use a gps to make some tracks but even then it's difficult because there are really too many trail options so it's tough to tell exactly where you are sometimes.