Talk:Type 4 Passive Sonar/@comment-28619432-20170106055229/@comment-27662847-20170106070520

In my opinion, better upgrade other equipment (BB-Gun, CA/CL-Gun , Akizuki-Gun , Iwai / Iwamoto Fighter Squadron) if you can do it rightnow. You will need tons of screw and resources for those. Upgrading Sonar only benefit temporary and limited situation on utility. Once you have High level DD focused on ASW stat (Like Asashio / Kiyoshimo) you will forgot about upgrading any Sonar/Depth Charge.