Don't know if anyone is interested but just returned from 7 days on the road, daily average around 70 miles, and I ended up using ridewithgps on my phone in airplane mode. I also carried an older 10k mah external battery - worked great! RWGps is great in airplane mode and can be set to come alive at turns and intersections. A few times a day I would go online during a stop so it would update my location (my wife was tracking me through the vacant wilderness of northern/central) Michigan. I only used the battery a couple times at the end of longer days, carrying it in a small handlebar bag.

What I don't like about RWGps is its inability to change or add routes on the app. This is a big missing and I hope they address it. For the couple times I went "off route" I used Google Maps in offline mode, which by the way works just fine. As much as I'd like a Garmin to play with, this combo works just fine.