
Map Action feature in the book on 'GIS made Easy' that I edited, that will be published in April 2012.
MapAction provides a mapping information service at the scene of any major disaster. Using techniques including geographical positioning systems (GPS), satellite communications, geographical information systems (GIS), and personal observation, MapAction produce maps depicting the dynamic situation. These are freely distributed to relief agencies.

Update
Map Action works in areas where there have been natural disasters which create problems for identifying locations and routes for aid.
Here are some images of places where they have worked recently...
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