A long time ago, I was asked by a consultant friend of mine to have a think about being able to drop portable wireless internet repeaters. The brief was that first responders could drop a bunch of wireless mesh routers over the area so that computers could be used and contact base.
At the time the emergency department decided that it would be a luxury and unnecessary so I didn't get to build a prototype.
However after numerous occasions of finding myself in a field, without internet access I though to revive the project in a limited way.
At least I'd get always-on wifi in the car .. right?