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There is an underlying coordinate system that could be used, but it isn't necessarily tied to any unit of measurement for use in the game. I suppose I could also pull the map into ArcView, and georeference the PotCO map to somewhere in the Caribbean to force some lat./long/ coordinates on it. Personally, my campaign maps use a basic UTM (Universal Transverse Mercator) system.
In the real world, I usually have my Garmin Csx close at hand, so I can always give my own lat./long. coordinates (and barometric pressure too); however, my little hand-held only has 3-5 meter accuracy, so for precision field projects I have to rely on borrowing a Trimble unit with sub-meter accuracy.
I guess it's the archaeologist in me, but I live in a world where everything inhabits a three-dimensional matrix where precise measurements can be taken/used to describe spatial relationships of not only the physical things but also the empty spaces. Since we destroy the real world record as we go, it is critical that we be able to recreate the entire 3D matrix with all original contexts (precise 3D spatial locations), so they can be completely (or as near as possible) recreated.
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