I am using the 5.4 version of MapSource. The version that came with my 60cs was 5.0 I believe. I upgraded from the Garmin site to the 5.4. I did not know about the 6.0 version coming out. I had a tough time getting the 60cs to communicate with the computer finally found the setting and everything is ok. Of course must use EasyMPS to convert to the appropriate format! Terry (GeoPioneer)