Well it does work upto a point. I can transfer from the 590 to the NAV VI, but not the other way around .

@Reinhard-32 I have a 590 as well, I'll give it try to transfer maps.

@Reinhard-32 there is still the option to transfer routes between Garmon sat navs, used it with my Nav VI and a 390. Thanks for the cable pointer, will try that from my android phone.

I didn't think it would work without a computer, but when searching came across a video from Myroute
https://support.myrouteapp.com/support/solutions/articles/12000050942-instruction-video-exporting-via-garmin-smart-link-iphone-
that shows it working.

I have been watching a video that shows how to upload a route directly to a Garmin 590 (plus others) from a mobile phone. I have access to a Samsung and IPhone 7 and have tried both (even though it says Android wont work), and cannot get it to work. Anyone else managed to do it?