Subs having radar

Just an idea and the only reason I came up with it is Bc in the game in currently in have no outposts. I'm currently running from my previously taken outpost to one I am trying to take and I can't see ANYTHING. I think subs should have some kind of radar so I can see something. Also subs in real life have radar so I think as they get farther away from your radar limit they could show more of the map. Just a thought for future reference .