@Brian-McG, I understand that, from your backup-device perspective. But I think the most use cases for multiple devices is for different circumstances. I use my daily Pixel in my car, and my Thinkphone only on my bike. Completely different use cases, for which I would dislike the sync you propose. But besides that, If you go on a multiday trip, don't you have your routes for that trip in their own folder? How much effort is it, to enable those to be shown on the map ONLY in case if you need your backup device? Maybe 2 or 3 seconds?