Those full bars of coverage you had at altitude are probably going to disappear the moment you lose line-of-sight. That said, aircraft have ELTs which are supp

Those full bars of coverage you had at altitude are probably going to disappear the moment you lose line-of-sight. That said, aircraft have ELTs which are supposed to trigger on impact and can be manually activated as well, so an InReach probably wouldn't make a life-or-death difference very often.