Ran the Olympic Peninsula loop twice last summer, once with a dedicated GPS and once with just my phone. The phone died by day three and the GPS had a trail split that wasn't on the paper map. How do you all handle backup navigation without carrying three devices?
Well that's a fun way to learn your phone doesn't like cold or GPS signals in trees, guess the peninsula wanted to humble you twice. My trick is a paper map in a zip bag and a spare battery pack, since the map can't die and the battery only needs to last long enough to charge the phone at lunch. Which trail split was wrong on the GPS, the one near Hurricane Ridge or somewhere out by the coast?