This apparent lack of functionality is the only thing holding me back from replacing my 76CSX with my new 66i as my default GPS receiver. If I add additional .ico files to the directory that holds the default one, would it then display those as assigned inside Basecamp or another program? Currently it converts any icons I've assigned to the generic default one which is a huge step backwards for me and a huge useablility flaw.
My most often used icons of the scores available on the GPSmap76CSX: geocache (closed), geocache (open), hotel, trailhead & car