The map share function is advertised as one of the functions that this sat-nav is supposed to be able to do. It seems as though TomTom are deliberately lying about this function and deceiving their customers. I have tried rebooting and resetting everything and searched the forums but mine still does not update. It seems that TomTom do not care and have no intention of making this work and treat their customers with total disregard. I'm never buying another TomTom, I'm switching to Garmin.