I am using Top USa, it is a one time purchase of 30 bucks or so. I can load lots of different maps, including the US Topo map series, all the way down to 16x zoom evel.The maps for my area, probably half of Arizona, were about 3 maybe 4 gig of data. One could also load music and play that at the same time, I personally would rather hear the bike and any potential objects I may collide with. Going for a night ride in a bit, I love riding the open desert on a cool night, especially with the map display.
