I too see potential for VarAC during emergencies. Protocol question: Does the underlying VARA HF/FM require the same kind of time synch precision that FT8 does? It is my understanding it does NOT, but wanted to verify.
If I'm correct in that assumption, it elevates VarAC for emergency use, IMHO. Protocols that require rigid time synch are not likely to be much help during gridless emergencies, IMHO.
In any case, I've been really enjoying learning about VarAC. It's the most meaningful digital comms I've encountered so far.
73 de K0RvW