In my last games i've noticed something strange. Some time others spot a ship and i rush to them, but when i'm near them they go unspotted. If the ships was only dd i may understand but that heppens with bb too, in my last game an hindenburg was near me at 4km of distance without any cover or smoke to shield him and i was unable to spot him, however my smoke was useless, but these maybe was an effect of some radar or something that i didn't see.
So i'm asking, does some unspotting cheat exist?