problem with historic battle -- ships do not appear on map screen

[I'm goin' down]

I played a historic battle from 1942. It involved a fleet of IJN warships returning from a battle where they inflicted heavy losses on US naval forces. I never observed nodes on the map indicating the locations of the various IJN ships. All I observed were radar lines running from my boat in there direction. I tried to plot the locations of the IJN ships using the Werner Sobe method of tracking by sonar, but it proved impossible because I did not know which ship the sonar man was identifying. Thus, I could not calculate the speed of the fleet, and could not set up an attack with the TDC, or use the Cromwell or O'Kane methods either. Basically, I was firing blind, guessing at the speed of the fleet, AOB, and target distance. I wasted a lot of torpedoes.

Does anyone have a solution to this problem?