I recently bought the Edge 530 and while I was creating a course in Garmin Express it said there was a map update available. After I installed the update the navigation on the Garmin became unusable. Sometimes it says ‘maps do not have routable roads in the area’, other times it just gives a short segment. The normal data screen with navigation at the top of the screen doesn’t happen any more. Any suggestions please? Garmin says it is new to them