Just got a Garmin Etrex 20. What maps do people suggest for good topos for the Sierra Nevadas, National Parks, Inyo, etc in California/Nevada areas?
I've heard a bit about the Nat Geo maps, but there seem to be a few of them. Wondering if someone could suggest/clarify the "right" one(s)? The Garmin Mapsource 24k National Park ones are popular.
Second, is there a good source that describes how to properly load maps onto an SD Card? Everything I read just says "it's easy" but doesn't really explain anything.
Thanks ahead of time, looking forward to testing this thing out next weekend!