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That good to know - will be sure to grab the app as a backup.
Experiment today saw my phone lose 50% battery over a couple hours, so the phone-only route isn't sustainable for now. In all fairness, it's an iPhone 7 that had its battery thoroughly trashed by a Canadian winter of outdoor work... works well enough otherwise but I can't expect too much of it.
Edge Explore is now on order - thanks everyone for the help!
trigs
You can have RWGPS app only turn on the screen when there's a turn. But it's not foolproof. You can also have it bark directions at you audibly. I like a combination of Edge/etrex GPS and phone for redundancy.