Have you tried another pendrive or to send it directly to your pc?
I am using Mapsource 6.16.3 patched. Using Maptool I can select my maps and on the left I can see the amount of megabites selected. When I select the "send maps" icon, Mapsource sees my USB stick and I click on send maps. Now I see a window saying "building mapset" and when this is completed I see for a brief moment "transferring Mapset". However the "transferring mapset" does not appear to happen. Following that I get a window saying "The data was successfully sent". When I check my usb stick there is a Garmin folder with only a small file inside named "gmapsupp.img". The file is size is only a few k's and much smaller than the data which should have been sent. When I try to send the same file to my Nuvi 760 it works just fine. Any help would be much appreciated.
Thanks for your response, Yes I have tried several pen drives and two sd cards but still I have the same problem. I think I might have a problem with my usb ports??
Does transfer to pc work ? Do you have updated Garmin USB drivers ? Try to reinstall Mapsource ,patch it again and retry
Thanks Catymag, I updated my usb drivers as you had sugested and all is well now. Many thanks for everyones help.