More info....
The registration process for PLBs and EPIRBs in Australia is mandatory and allows a lot of information to be included including travel plans, photos of the vehicle and emergency contacts. The authorities would have called those emergency contacts, so they knew EXACTLY who they were dealing with long before they arrived. So while a PLB or EPIRB is a simple one way communication devise it can be and is a very cheap and effective tool.
This would have also contributed to the time it took to get the search aircraft to them.
I note on another report that the first emergency drop from the aircraft included DVDs, sweets, nappies and a letter from the grandfather of the kids.
Cheers,
Peter
OKA196 motorhome