I am looking for a good GPS route from Lake Topaz in Nevada to Mammoth and back. I rode a two day ride on a loop to Mammoth and back, but before I had a gps so I could not track it. We went to an area I remember as "Top of the World", a little single track before that. I remember hitting a town for lunch and fuel, then going out by a large volcanic ash mountain that we rode down for fun. Then went into Mammoth and stayed the night. The next day we left and seemed to ride most of Nevada back, stopping in a basically a restaurant/gas station town for lunch. The last stretch seemed like we hit some marsh type land, then ran a dirt road back to the trucks. Countdown, maybe you could help me out. I rode it with Gill, Jerry Jenkins, my dad Stan Sandgren. Let me know if what I described jogs your memory.