My character is not well-versed in Geography, and thus would not know to refer to any maps. I think it would be more realistic to play it from that perspective, so I probably would not benefit from a map per se. I may gain some out-of-character knowledge from it, and be able to use that to plan some posts, but that would be it.

I can't speak for everyone, however. In any event, it would be a useful tool.