WindyChuffer
Registered user
I'm pretty sure they are both operating on 5v d.c. (USB power supply), but it is possible that BMW have specified that Garmin build in a code that the NAV 5 only charges from a BMW/garmin mount? A bit like Apple do/did with their stuff.
As with the Apple gear - a third-party charger worked with one OS, but didn't when you updated to the latest iOS? Could be similar with NAV 5?
Al
No. See my earlier post.

