With any of these devices there's always the possibility of a failure. When they work then they work and as R93 said they're not going to send out the wrong coordinates but there is one case that was quite prominent when the Australian "superstar Instagram hunter" (man I hate that egotistical prick..) Adam Greentree set off an Inreach after a fall and it failed to send the SOS message, he did however manage to get it to send a normal message and sent instructions about his whereabouts etc. They're a handy tool for communication etc but would I rely on one 100% as an emergency beacon? Probably not.. But then, there's the same chance an actual PLB could fail to operate properly also so at the end of the day you need to back yourself as much as you can, hope for the best and prepare for the worst.
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