Although the latest software updates have massively improved the reliability of the built-in navigation I have decided to keep my Zumo XT as the "go to" nav solution on my 2021 RT, for two main reasons:-
Firstly, it is accessible and easy to use whilst riding - whilst some functions of the nav can be accessed via the bike menu, anything complex requires stopping, taking out the phone and faffing about (particularly if you have to put on reading glasses to see the phone
)
Secondly, the re-starting of the bike system after e.g. a petrol stop (and yes it does actually re-start properly now, it didn't before) takes a ludicrously long time. Not ideal if you are relying on it in unfamiliar territory.
I mounted the Zumo using a Wunderlich bar bolt thingy as here
https://www.bmwlt.com/threads/mount...0rt-has-anyone-done-this.191915/#post-1972724 (Hors Piste posts are mine)
But I see in one of his recent videos that Nothing to Prove Scott has used a different Wunderlich solution to mount a RAM ball, which is quite neat.
I understand that the BMW mount referenced above requires the drilling of holes. I didn't want any of that.
I power mine from an ezCAN, since I wanted to power some other things as well.
An iPhone 11 Pro Max will just about fit in the charging cubby but only if it has no sleeve of any kind fitted. Removing the sleeve made mine so slippery that I was bound to drop it so I bought a Mark 2(3?) iPhone SE to use as a dedicated bike phone.
I guess lots of cheaper phone solutions would work (you don't even need a SIM card if you're not worried about traffic updates).
For me the bike system is a handy back-up, but I use the Zumo for "proper" nav.
Some people still seem to be having issues with the bike system, although my nav now seems to work OK I do have the "app doesn't recognise the bike" trip recording issue, but this doesn't affect the nav.