"You need to obtain TomTom software, I used v6.010. Now the trick to making this work is to get hold of the "installed" files, I managed to do this by installing on my PDA first and then copying across the TomTom folder on my PDA to an SD card.
Then put the map folder onto the root of the SD Card.
By now you should have to folders on the SD CARD
>>Tomtom
>>Great Britain
Rename the Tomtom folder to "mobilenavigator".
Inside the "mobilenavigator" folder find "tomtom.exe" and rename it "mobilenavigator.exe".
Reboot and when you click the navi software button, tomtom will start. The first time i ran it I got an error, but ever since it has worked perfectly.
To get GPS and Tomtom talking you set the GPS receiver option in Tomtom to other NMEA receiver, Baud rate 4800 and COM1.
I have been using this for 2 weeks now and really pleased with my Navigo tomtom!
It is also possible to unlock WINCE but I'll save that for another day!
Notes:
Use a different SD Card, if this goes wrong you can just put the old back and it will work again.
The hardest part of this is getting the installed tomtom files, If you don't have a PDA then one way to get the tomtom installed files would be to extract them from the installer Cab file using a pocket PC Cab utility."
There you go