[KosCo]

Thanks for the couple of suggestions mentioned below.

There are no instructions on how to install the new maps - thought it would just be a matter of swapping SD cards. The only information that I have been provided on the overall operations of Sat Nav is what is contained in the Owners Maunual - all of 4 pages of it. The TomTom in the other car has a guide that is 116 pages long.

Anyway, what I found was that when I inserted the new SD card - I got an error message "Navigation - Data Error - Check SD card". What I then found out was to basically ignore this error message and press OK. It then went on and installed the software and finally it all seems to be working.