Your WO has the eyes of an eagle!
I've been nose to nose with my computer screen looking in the general direction on the contact and most of the time unless the conditions are just completely poor I can just barely make out the smoke on the horizon.
Or I just pull away from the screen crosseyed...
Just point your U-Boat in the direction of the contact and it will come into view. Becareful though. I've had a Flower class Corvette appear out of heavy fog in a driving rain at night at 500 meters. I can picture the scene: My WO going "Holy Crap!" Their WO going "Oh $&@#!" as everybody scrambles to their stations... and the U-Boat captain pauses the game to go an clean his shorts.
