Managed to stop my map update part way through at the w/e (it was taking forever to download - 23hrs remaining time ?!) and thought I'd got away with it but only base-level map on my NAV5 this morning. At work now and noticed that I had managed to download the map to BaseCamp at some point ("Installed maps compatible with Basecamp") over the weekend. Is there any way of getting the map from my laptop HDD (.gmap file type 4.6gb...is that too small - perhaps not fully downloaded ?) to my Nav5 ?