Topics

Just bought Oregon 450t and 8 gig SD chip with the hope of being able to download 24k topos from websites, etc.  I tried to follow the instructions on GPSfiledepot, but to no success.  I can see all the map files (I assume these are individual 24k maps) on the micro SD chip when it is hooked up to the PC and that they have the extension .img but when I go to Setup>Map>Map Information Select Map  I cannot see them in order to select them for use.  Also of note, if I try to open them on my PC in MapSource it says Washington Topo/22C29297.img is not a valid MapSource file and cannot be opened.  Any ideas what I am doing wrong?