Now the only problem I still have is that the USB is so horribly slow on the Edge 705 - it takes over an hour for BaseCamp to finally pull up an IMG file from the SD card (a large img like CN North America or CN Europe or any of the Topo maps - those 1-2gb images).

So I guess the next thing I need to learn is how to get an image to read in BaseCamp and/or MapSource from the hard drive rather than through the USB connection to the garmin device. Is there a good way to convert an image into a gmap format to install on the PC?