(ask) problem with enemy's course and precisely fire torpedo with sonar

[lajulanian]

I had a problem with enemy's course and precisely fire torpedo with sonar.

step that I already done :
1. I enter the sonar room, find the bearing until the light is on.
2. send bearing to the TDC.
3. determine the target. if enemy, in below 4000 m, it point to the some range.
4. I send the range to the TDC.
5. Fist : I set mark 1 to the enemy's ship.

and I repeat the sep 1 -5. until I get fifth mark. but the result on the mark is get me confuse.to set the angle of bow (AOB)

is there any suggstion ?

Nb: I use sonar because is Night. dark...

Thanks... sory for the bad english