It would be good to provide a preinstalled set of National Grids that are often mandated for use for emergency management. E.g in the US, the US National Grid is mandated for use, and so Sahana needs to be able to support display and input of USNG coords. There is already an interface for managing this, but it is complex, and it would be good to have a single combo box that allows admin selection of a projection/coord system and this changes all input/display for the whole system.

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