Before uploading new routes to my 660 I always delete the routes on the unit. Everything says it's deleting the routes and when I list the routes on the unit it says there aren't available do I want to create one. OK the unit seems to be empty, but yet when I import my new routes a lot of the time, not always, the old routes show up when I list the routes to make sure the new routes were imported. What's up with this? How do you "permanently" delete old routes from the unit?
How are you deleting it ... I've never encountered any problems using Windows Explorer?