In reply to ExiledScot:
> Not search, but a friend of the injured party may have left to find a phone signal etc... getting a person on scene fast is vital for both confirming their location (many folk won't knew exactly where they were) and deciding medical & rescue equipment required.
That sounds like a case for this drone that you're making here.
A friend of the injured party has left them to find a phone signal and call for help. Because the injured party is somewhere that has no phone signal - the drone launches, and then for 12 hours or so there is a solid signal at the injured party's location.
The casualty can use their own phone to relay their location, and assuming the friend passed on their number the MRT can actually call the casualty and/or send them a SARLOC message.
Or perhaps by some other means, assuming the casualty has a smartphone, they can use their phone's GPS capabilities to pass on their coordinates. (Lets not rehash the debate about which specific app they might use.)
Meanwhile if the casualty is immobile the friend who left them to find a signal can make their way back to them, and still have a signal when they get there.
> Even perfect phone comms doesn't remove the desire to have trained team member there asap.
In a serious case of course not, but solid phone comms can help enormously to establish precisely where "there" actually is - which is key to the "asap" part.
In less serious cases having solid comms with the 'casualty' might actually make a physical response unnecessary, by establishing that a call out is a false alarm possibly, or by giving directions and advice and then monitoring their progress as they walk themselves off the hill.