Hi Ze, that's what I have-the free California Topo. Took a while to figure out how to use it, but it seems pretty detailed and it was free, so can't complain.
I created a route from the Tram Station to Round Valley using MapSource and trandferred that to my GPS, and that seemed to work too.
There is another Garmin program called Basecamp, but I couldn't get it to load on my computer for some reason, so don't know what it looks like. I think it does similar things to MapSource.
