[whobodym]

I understand the desire, but I found trying to keep my 2017 up to date (bought new) frustrating and unsatisfactory. The instructions at hand, as you say, are meager and murky. I was at one point told to buy a small online dongle gizmo that the microSD card fits into, to speed up data transfer or some such, when connected to your computer. I'm not sure I ever got this to work, and the last time I tried, the slot in the gizmo was bent or something and I couldn't even insert the mSD card. My nav method now - and we have taken many quite long trips doing this - is to use both the Forester's OEM nav plus our portable Garmin on its suction cup, and then supplement with Google Maps on our phones. Phones are far better at exact current locations of restaurants, etc. The OEM + Garmin method can be pretty cool at times. Sometimes you can choose to have two different destinations in effect simultaneously, without the confusion question of "waypoints" and what the ETA time means. Or in places where the two devices disagree about the same one destination, you have a "tie breaker" or whatever you want to call it.