does it have "dead(arrested) man switch" mode? ie. the message is sent if user didn't checked in into the app for longer than, say, an hour or two (the app may

does it have "dead(arrested) man switch" mode? ie. the message is sent if user didn't checked in into the app for longer than, say, an hour or two (the app may buzz-remind something like 15/5 min before the time is up and also to start preserving (and/or posting it to some website) the retro-recording of the last hour as the others suggested). Otherwise, one may just not have the chance to tap the app if things get rough and fast.