Since Saturday, more than 400 volunteers have made nearly three quarters of a million additions to a free, online map of areas in and around the Philippines. Those additions reflect the land before the storm, but they will help Red Cross workers and volunteers make critical decisions after it about where to send food, water, and supplies.

These things are easy to hyperbolize, but in the Philippines, now, it is highly likely that free mapping data and software—and the community that support them—will save lives.

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