IDEA: You can only view enemy positions in adjacent territories, everything else is hidden. As you explore the map, the fog will be removed from adjacent territories within view.
This would either be a custom game setting, enabled by the game host (so not a default setting for all maps).
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Michel, yes we had similar thoughts for ally territories e.g. you could see all ally territories and territories adjacent to those as well. Making it dependent on "level" of alliance set is a neat touch.