So Giomen, instead of a smartass remark, because I did look through all the forums, the answer seems to be no. Catymag, thanks, saw that post as well, but no solution. Tried merging with no luck. What would be nice to see is a 640 and how it is setup file structure wise, because that device comes from Garmin with both CityNavigator and Bluechart g2 preloaded. So, it seems it can be done, but no one on here has a 640. Should I ever get a chance to look at a 640, or I finally come up with a solution, I will be more than happy to post it here. Once again, thanks.