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==Notes==
==Notes==
Ships receive a 15% ASW synergy bonus when this is used together with a [[:Category:Depth Charge Projectors|depth charge projector]] or [[:Category:Depth Charges|depth charge]]; and a 43% bonus when all three types are used (must be on the same ship). The 43% bonus does not apply when used together with a [[:Category:Special Depth Charge Projectors|special DCP]].
Ships receive a 15% [[Damage Calculations#Anti-Submarine Warfare|ASW synergy bonus]] when this is used together with a [[:Category:Depth Charge Projectors|depth charge projector]] or [[:Category:Depth Charges|depth charge]]; and a 43% bonus when all three types are used (must be on the same ship). The 43% bonus does not apply when used together with a [[:Category:Special Depth Charge Projectors|special DCP]].
<div class="mw-collapsible"><h3>How To Obtain</h3>
<div class="mw-collapsible"><h3>How To Obtain</h3>
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<div class="mw-collapsible><h3>Updates History</h3>
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* '''2013-05-08:''' '''Implemented'''
* '''2013-11-01:''' '''Stats increased:''' '''{{ASW}}+4 {{Hit}}+0 → {{ASW}}+6 {{Hit}}+1 '''
* '''2014-02-26:''' [[Damage Calculations#Anti-Submarine Warfare|Depth charge synergy]] added
* '''2015-01-09:''' Became '''improvable''' and '''upgradeable''' to {{Equipment/Link|Type 3 Active Sonar}}
* '''2015-06-26:''' [[Accuracy, Evasion and Criticals#Evasion Formulas|Bonus torpedo evasion from improvement]] added
* '''2015-09-25:''' Became '''upgradeable''' to {{Equipment/Link|Type 4 Passive Sonar}}
* '''2017-02-28:''' Build rate increased
* '''2021-03-01:''' Visible bonuses added for {{Ship/Link|Katori|Kashima|text=Katori-class}}
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==Fit Bonuses==
{{:Type 93 Passive Sonar/Bonuses}}
==Akashi's Improvement Arsenal==
==Akashi's Improvement Arsenal==