I live in an earthquake zone and have been taking CERT emergency training courses. Have been looking at these as part of a neighborhood emergency network.

Turns out SeedStudio sells these with a base that comes with a display and a bunch of grove connectors, as well as a cheap GPS module. Will have to think a bit more on what else may be needed (keyboard, display, battery, vibration, or other environmental sensors?)

It may be possible to build one of these for < $50USD and hopefully cheaper, then have each emergency sector in the city keep one as part of their emergency cache. Would be useful if cell networks and power go out.