Aside from having the paper copy as a backup, I know that a lot of the Gorge Rats use Avenza, but I've had good luck with Alltrails. As long as you download the map (and whatever layers you want) to your phone before you loose cell signal I've never had a problem. It also has my actual gps tracks (don't mind the backtracking that I did for video shots) to see exactly where the trail goes and waypoints that I've marked (water crossings, water sources, camp sites, views, etc).
https://www.alltrails.com/explore/ma...olfpit-5a38a1e
You can also print a copy of the map from Alltrails with the waypoints and the tracks, but the detail of the trail names won't show up on it either.
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