There's certainly a lot of positive feedback out there for GAIA GPS on the hiking sites, and apparently there were some significant upgrades in mid-2020:
https://www.adventurealan.com/huge-improvements-next-gen-gaia-gps-hiking-app/

Does anyone have any experience with the AllTrails Pro app?
(https://www.alltrails.com/pro )

The one-year plan at $30 seems steep, but the $60 for 3 years seems not too bad. I've used their website a bit, and it seems competent.

Hmmm: here's a mammoth GAIA GPS vs. All-Trails review by a long-term AllTrails user about what things were important to him (offline maps being a must-have) and why he switched to GAIA GPS last here:
https://www.n1clc.com/2020/09/revisting-alltrails-vs-gaia-from-hams.html?showComment=1600265444687

Here are some other comparative reviews that include both:

(Nov 2020): https://takeahike.us/alltrails-vs-gaia-gps/

GAIA GPS, Alltrails and other apps. They like Greentracks for offline maps (Android only)

https://besthiking.net/best-hiking-apps-test-review/

https://www.territorysupply.com/alltrails-vs-gaia-gps

(note this next review is on the Gaia GPS site ...)
https://blog.gaiagps.com/gaia-gps-vs-alltrails-2/
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A signal mirror should backup a radio distress signal, like a 406 MHz PLB (ACR PLB) (Ocean Signal PLB)