This doesn't seem terribly hard to implement, but I was walking through the usage scenarios of something like this and noticed that there are other apps that can send out mass text messages already: https://play.google.com/store/apps/details?id=com.corollarycomputing.mtp
Is the value of doing a fire-fighter specific app in being able to do one-click response with the ETA?
My understanding is that most volunteer fire departments don't issue radios to everyone, so the issue is quickly coordinating communication between people that don't have radios.
Could you run us through what the current response scenarios look like? It seems like having a dispatcher send off the mass message to everybody requesting status to coordinate would work better in this case because not everybody is going to have an android phone.