we have a colorado now but we used to use a tomtom xl..what you do if menus are same is find location by lat/long, this gets you somewhere close, by road or foot, then when you are somewhere near, you switch to the screen which says find help, then it gives you your lat and long readings which alter as you walk, its a case then of stumbling around till your readings are same as the cache, we found a few this way, quite simple but hard to explain