Type 4 Passive Sonar/Bonuses

Ship	Extra Requirement									Note
Yuubari Kai Ni D					+3				+5	Non-stackable
Noshiro Kai Ni					+2				+4	Non-stackable
Isuzu Kai Ni Naka Kai Ni Yura Kai Ni Yuubari Kai Ni/Toku Yukikaze Kai Ni					+1				+3	Non-stackable
Akizuki-class					+1				+2	Non-stackable
Katori-class					+2				+3	One-time between Type 93 Passive Sonar, Type 3 Active Sonar, Type 4 Passive Sonar and Type 3 Active Sonar Kai