We are a company which do a lot of maintanance work at our clients, and in many different districts. We wish to implement permanent routs to the GPS. The driver can turn on the GPS, choose between different pre defined routes, and let the GPS do the rest of the job. We have many drivers, with their own GPS, and the client list is updated often. Therefore these routs has to be updated externally. E.g. TomTom has the SD card, where the routs can be installed...posible? Any other options? Smart phone solutions?