yes!!! somone else thought about fog!!!
i posted a few ideas in the gameplay/feedback forum a while back about fog. wouldn't it make sense for coastal bases to be fogged in every now and again?
im guessing it would be very hard to model realistically like the "fog of war" in some other games around. (so that it obscures your view 1000 away but not right in front of you) it would aslo put a major hit on frame rates i think

but it still would be UBER COOL:D