Newbie to both the forum and downloading map programs. I just ordered a eTrex Vista HXC and would like to get topo maps of at least WY and MO so I downloaded Midwest USA Topo. It says its free yet it will only show up on one area of WY. Then it asks for an unlockkey to open other areas. What's up? Also what is the best Topo maps for hunting that are free?