You don't say what year vehicle you have. Best guess, use your cell phone pull up Google Maps. I do not believe that the system Honda uses is a pure Garmin maps in the current system, rather it is a Honda system that uses Garmin maps programed for Honda. If you have a 2nd Gen Pilot, not sure who provided the maps for Honda. Again however, the maps were probably Honda specific.
Since the Pilot is not built for the European market, I doubt that Honda supports European maps for it for the Pilot. With Honda, installing the maps on the 2nd Gen Pilot was vehicle specific via the VIN. With the 3rd generation they are vehicle specific via the head unit/vin.