Keyfuels SAT NAV Overlay enables you to set up files which you can then download directly to your
SAT NAV device. Files are available in Mappoint or Tom Tom format. A
number of different files can be downloaded, these include All Keyfuels
Sites, HGV Sites, LCV Sites and All Smart Sites so that you can tailor the
system to your specific requirements.
keyfuelsdriver.net ( free services)
you need a keyfuels card and pin to join the Keyfuels Drivers Club, but its free 
I joined and downloaded the sites to import onto my Garmin i3 StreetPilot. It did not work properly and I had to manipulate the data in an Excel CSV file before it would import properly. Basically the column data is not in the right order for the Garmin to read. Also checking the raw data some sites listed in the file DON’T have co-ordinates and so when you try to import them it stops when it gets to one of these records.
As I have the ability to do this it was just a minor time waste but for others I imagine it could totaly confuse them.
SoA