Hi. This is a query pertaining to the Zumo 660 LM. Prior to owning this device I had the older Zumo 500 model. The Zumo 500 could take up to 50 routes. Seems the 660 LM only takes 20. To my knowledge routes have to be "imported" onto the internal memory of the device to be used. My question is, is there any way to install readable routes on the SD card so the device can read the route directly from the SD card rather than its internal memory? I know this can be done with maps but can it be done with routes? or do I just have to live with the fact that 20 routes is my max? Thank you very much in advance.