[chpwssn]

All the way back in a February 1994 QST article N6XMW proposed "the Wilderness Protocol", my theory is that both _could_ provide a group of people that are coordinated already a good basis to pick up but there just isn't enough coordination for random hams to use it.

The most successful system I've seen are areas with linked repeaters and good backcountry coverage have operators that are volunteering to keep the network monitored during most of the day[0]. Repeaters are always listening and can backhaul you to someone listening in a shack at home. Sure, it relies on a repeater network but it's slightly more likely than a stranger being near you also following the same protocol.

[0]: eg https://co-cern.org/