Did the High Sierra Trail last fall. My phone map app glitched out. My old compass kept me on track. Some hikers think apps are all you need. I say a compass never fails. Which side are you on for route finding?
A compass "never fails" until you don't know how to use it right. My phone gives me a full topo map and my exact GPS spot, which a basic compass just can't do. For most people on trail, a charged battery and a backup power bank is way more reliable than trying to remember declination.
Had a similar thing happen but with a phone map and a backup battery. The detailed trail view showed a washed-out bridge the paper map missed. That extra info kept the whole group from a dangerous detour.