Reply #9: sonar

[Parche]

Most of the time they would use the sonar, or radar for that matter with one
'blip' to get a range on the target, or destroyer.
Knowing that later in the war that Japan had radar on some ships, the subs didnt want to be
detected with using radar or sonar full time.
They would also us SD Radar as little as possible for aircraft detection, as some stations
would DF on their signal and send out anti-sub ops.