I wanted to copy the UK & France maps to a fresh memory card. I did this using the application on the DVD under Windows XP - looking at the directory structures created it looks like it is not just a case of copying the relevant folders across.

I installed the maps with the memory card in my 770 attached via USB - big mistake it is very slow, took over 30 mins I reinstalled using a Sandisk USB card reader and it only took a few minutes.

Kevin