Type 4 Passive Sonar

[Edit] Type 4 Passive Sonar No.149 四式水中聴音機
Small Sonar Effects: +1 +12 +1 Scrap value: 1 3 (Unbuildable)
Refittable Ship Types
Coastal Defense Ship	Destroyer
Light Cruiser	Torpedo Cruiser
Heavy Cruiser	Training Cruiser
Aviation Cruiser	Fast Battleship
Battleship	Aviation Battleship
Light Carrier	Standard Aircraft Carrier
Armored Carrier	Seaplane Tender
Submarine	Aircraft Carrying Submarine
Submarine Tender	Fleet Oiler
Repair Ship	Amphibious Assault Ship

Introduction

小型艦艇にも装備可能な、新型パッシブソナー兵装です。
九三式水中聴音機に比べて、その対潜発見能力は格段に向上しました。
数は少ないですが、大戦末期に建造された後期型の駆逐艦などの対潜兵装として装備されました。

This SONAR can be equipped on smaller ships, and is a new type of armament: the "passive SONAR." Compared to the type 93 SONARs, this has increased ASW. There are few of these because it was made in the later part of the war, and was equipped by some of the newer destroyers.

Notes

Not buildable. Ships receive a boost of 15% more ASW firepower when this is used together with a depth charge launcher or depth charge, and 143% more power when all three types are used (must be on the same ship)

Rank Reward for August 2015. Quest reward from the Saury 2015 Seasonal Event.

Type 93 sonars can be upgraded to this in Akashi's Improvement Arsenal