I love the simplicity of this idea.

The team consulted emergency workers from the Haiti and Fukushima disasters and developed a “victim app” and a “seeker app”. “They wanted it simple, unencrypted and smart,” says Al-Akkad.That meant avoiding known problems like low-power, low-range Bluetooth radio links, which often fail to connect – or “pair” – with each other amid the clutter of metallic debris in broken buildings. So they stuck to the much more robust and receivable Wi-Fi radio.

With the victim app a trapped person can write a 27-character message such as “broken leg stuck in bank” or “need help fire on 4th floor” and a seeker app up to 100 metres away can pick it up. The app found two “trapped” people in a large-scale, simulated terrorist attack at a seaside chemical plant in Stavanger, Norway – an exercise organised by the Norway-based research organisation Sintef.

This is the kind of thing that should just ship on every phone.