I had my satnav with me last year.
I have a mio 168 and TOM TOM installed I have a map that I downloaded
from the net of Eastern europe this covers most of Europe france switzerland italy and most other parts it also covers the mainland of Greece.
I didnt expect to get anything on Corfu as there isnt really a map for there
but it did pick up all the main areas of Corfu it mainly showed the two main roads they are just shown as the 24and 25 it does show the main villages
it also shows the lake koriston I was able to ask it for a route but it
wasnt really shure where it was as it told me to turn right when there was no right turn so it was a bit hit and miss but as I said the map didnt
actually cover Corfu so I was very suprised that It worked at all.
maybye this year they will do a map of Corfu