Hi all, I've hit a bit of a roadblock... I have a Garmin Vista C circa 2007. It came with the now-obsolete Mapsource CD-ROMs. Long story short, those are now long lost and I have also since donated the PC I used to upload the map detail. I still have the GPS unit with some limited detail installed but need to upload new detail. I now have a Macbook, so even if I can find some old Mapsource CDs, it looks like they are all PC-only compatible? I tried installing the Mac-based Mapinstall but when I plug in my unit it only says "No unlocked maps found for this device". So, any thoughts on how to get map detail loaded onto a 9-yr old Vista C from a Macbook? Any suggestions are much appreciated! E