@janch
It depends which Motorrad Nav model how many hoops you have to jump thru using 'unofficial' mapping. Some are quite old however as far as i can recall none have the problems which are reported for Honda Goldwing Nav units using unlocked NT maps. If you need more info tell us the model. I think all the Motorrad Nav are zumo based whereas the GW Navs are StreetPilot related.