Move on with the times, and buy a BMW compatible Carpuride or CHIGEE unit. Your wonderwheel will work its magic just as well as with Nav 5 or 6. The difference is, you will have an option to use Google Maps, Apple Maps, Waze, MyRoute App, Kurviger, and a whole host of other navigation and routing software that is installed on your phone.Then any modern GPS unit from the likes of Garmin or TomTom will do you.
There are lots of posts / threads on which communication (coms, to use the bikermate speak) system is best.
Me? I’d suggest:
BMW Nav V or a third generation Nav VI, especially if your bike has BMW ‘sat nav prep’ and the wonder wheel. Or, failing those, any Garmin equivalent, up to and including the first generation XT unit.
Several suitable devices come up for sale on UKGSer, quite regularly.
For example you are the type who does ride all day on your euro jaunt then at 3pm decides that you have had enough and need ti find that hotel for the night. Google maps search, tap on a desired hospitality venue, directions, chose your route (normally you’ll have 3 options to choose from) then tap on directions and start. No faffing with taping in address into ageing Nav 5, then hoping if it’ll find the correct coordinates. Simple and effective.
I’ve got a CHIGEE device (non BMW) and am very happy with what it does for me.


I have had Garmin previously, including an early BMW system that did not have post code capability ! That was interesting. Latterly, I had another Garmin, though I can't remember which one it was. That worked very well and got me across Europe to Greece and the Islands and many other places.