@Neil, thanks for your advice Neil,
my question is this, I always prefer to have a install for Mapsource or Basecamp, now a days more for Basecamp since Mapsource is becoming more and more death. When I have the map installed on my computer I can choose which portions of the map I want to send to my device. For example the map of France, I don't want the whole map of France on my device but just the parts that I need. When I install several maps in Basecamp, I can choose from each map which sections I want, and so which maps I have on my device. That's the reason why I use a install version of a map on my PC. When you use a IMAGE on a sd card, I suppose that you only have that full map on your sd card and on your device and you're not able to switch between maps.
Is this correct? That's why I don't see the point of using image files for maps...and always install versions...
Please correct me if I'm wrong,