One of the challenges in any disaster response is getting information to and from those affected.
But as we saw yet again in Christchurch yesterday, communication lines get overloaded, and what's left is an information vacuum.
What's needed is a simple, reliable way of exchanging information, one that can provide specific advice to people in need.
Reporter Lachlan Forsyth met with a Tauranga company that thinks it has the answer.
Watch the video.