You could get hydro guy to follow target.
Set you cfg for TC so that there is no sound at TC??
Set TC to ?? when waiting for the next bearing.
Or just take readings from th convoy.
If they are close enough then you will soon see them so no need for 4 bearings.
If the are far away the the error for first ship to last ship wont be to high.
Just use the meathod to find the convoy and use visual to hunt and kill
