I'm waiting for my Montana to get here, I have already received my maps and cradle. I have an etrex legend Cx that just has the base map. Somewhere I got the idea that the 24K Topo maps on DVD did not lock to one GPS; you can put it on more than one GPS. I haven't loaded the 24K Topo or the City Navigator onto the computer yet, I've been waiting for the Montana to get here. I'm worried about one of those Garmin "gotchas"- Like "Oh you put that topo on the Extrex? Well, you have to buy it again for the Montana." So if I install basecamp and put the Topo 24K on the Etrex, can I still put in on the Montana?