I always operate the hydrophone myself...... the stupid guy cant even hear a target thats 5 km away....
Where as i can hear targets that are 40 km away.
I havent spent any points on his abilitys, to be fair... but still, he should be able to hear things at 5km. I even put the needle on the sound for him and asked him... but still he says " no contacts".
But sometimes he does hear them..... I guess its a bug or to do with the realistic 3d sound travel option that i have ticked.