My previous satnav (by an alternative maker) had a facility whereby you could add features to the map. I have locally to me a public road that runs through an park belonging to a Hall, the satnav diverts around this adding miles to the journey. Can I show the map that this is a pukka route? Obviously local knowledge and common sense allows me to ignore the route shown but my wife will always go by the book so to speak. Garmin 51