Talk:Type 3 Active Sonar/@comment-72.222.158.64-20170113173700/@comment-3502824-20170113174425

You don't upgrade Type 3 to Type 4.

You upgrade Type 93 to Type 4.

Keep enough around for a Combined Fleet "just in case", where we face a situation where we are against a Submarine Hime using Transport Combined Fleet. A similar case to this was Fall 2015 Event, where we faced against Submarine Hime and her BB Hime, Wo-kyuu and submarine minions with a Combined Fleet.

Also I do recommend upgrading some SONAR. to at least 6 stars for increased evasion against Torpedoes. Good to usem but it's not a high priority.