I think current technology will and, for me, already is providing a sarwatch, via a Spot GPS tracker/transmitter.
before departure, start the tracker, it will send a position report every 5 mins back to the people holding my sartime, they can track my flight live. (via google maps) if my track suddently stops in the middle of nowhere, they will notice within 5 mins, if i havnt already triggered the SOS epirb alarm. simple easy to use.
why cant such technology be adapted for regular aircraft use. and monitored from a central location? the infrastructure is in place and operational, it works for all other outdoor types of activities. why not?