[willshake]

I relied heavily on my surface-to-air radar to keep me aprised of approaching Japanese aircraft during my first half-dozen patrols. At that point I had enough points to purchase surface radar. Wonderful, now I'm covered high and low, thought I. But now my SA radar appears not to be working. I've been dive-bombed twice on patrol 7 by planes that appeared overhead with no prior warning. Luckily their aim was bad, and I'm still afloat. What's wrong here?