Historical I.J.N. escorts use of active sonar V.S. SHIV escorts use of active sonar

[Capt. Morgan]

As I understand it, SHIV is hard-coded so that Japanese escorts are - in effect - always using active sonar. While you won't hear them pinging until after they have been alerted, if you are within a certain distance of an escort, you will be detected no matter how stealthy you have been. Is that a fair description of how SHIV models the use of active sonar by I.J.N. escorts? Even though we can not hear their pings, are they on active all the time?

Secondly, when ( if ever ) did I.J.N. escorts adopt a policy of using active sonar all of the time ?

While this practice would reveal the position of the convoy from quite a long range, It would seem to me that once the I.J.N. realized that the U.S. submarines were radar-equipped, there would no longer be any tactical advantage to using only passive/stealthy means of conducting A.S.W.

Did they ever patrol in this manner, and if so, when did they start?