Type 3 Active Sonar

[Edit] Type 3 Active Sonar No.47 三式水中探信儀
Small Sonar Effects: +10 +2 Scrap value: 1 2 (Buildable)
Refittable Ship Types
Fast Battleship	Battleship
Aviation Battleship	Standard Aircraft Carrier
Armored Carrier	Light Carrier
Heavy Cruiser	Aviation Cruiser
Light Cruiser	Torpedo Cruiser
Training Cruiser	Destroyer
Coastal Defense Ship	Submarine
Aircraft Carrying Submarine	Seaplane Tender
Fleet Oiler	Submarine Tender
Repair Ship	Amphibious Assault Ship

Introduction

対潜兵装です。
いわゆるアクティブソナーです。性能は残念ながら、ものすごく高くはありません。
それでも、他兵装と組み合わせて、練度の高い駆逐艦で敵潜水艦隊を文字通り駆逐してください！

An anti-submarine weapon, also called the "active sonar".
It doesn't have impressive performance; however, when used in tandem with other equipment, a veteran destroyer will surely put enemy submarines down!

Mechanics

Sonars are the main equipment used for ASW, being required to trigger most OASW, and greatly enhancing ASW Damage Synergy. Their main stat is "ASW" .

ASW Damage Synergy
Small Small Sonars	Type 93 Passive Sonar Type 4 Passive Sonar Type 3 Active Sonar Type 3 Active Sonar Kai Type124 ASDIC Type144/147 ASDIC HF/DF + Type144/147 ASDIC
Large Large Sonars	Type 0 Passive Sonar
DCP Depth Charge Projectors (DCP)	Type 94 Depth Charge Projector Type 3 Depth Charge Projector Type 3 Depth Charge Projector (Concentrated Deployment) Prototype 15cm 9-tube ASW Rocket Launcher RUR-4A Weapon Alpha Kai AP Mk.32 ASW Torpedo (Mk.2 Thrower) AP
DCR Depth Charge (Racks) (DCR)	Type 95 Depth Charge AP Type 2 Depth Charge AP Lightweight ASW Torpedo (Initial Test Model) AP Hedgehog (Initial Model) AP Type 2 Depth Charge Kai Ni AP
Other ASW Mortars	Type 2 12cm Mortar Kai Type 2 12cm Mortar Kai (Concentrated Deployment)
ASW Damage Modifiers: [math]\displaystyle{ \text{Mod}_\text{synergy} = {Mod}_\text{1} \times {Mod}_\text{2} }[/math]
[math]\displaystyle{ {Mod}_\text{1} }[/math]	+ (Any Sonar + Any Depth Charge)	1.15
[math]\displaystyle{ {Mod}_\text{2} }[/math]	DCP + DCR and NO Small	1.1
	Small + DCP + DCR	1.25
Examples
[math]\displaystyle{ \text{Mod}_\text{synergy} }[/math]	Small + DCP + DCR	1.4375[math]\displaystyle{ 1.15 \times 1.25 }[/math]
	Large + DCP + DCR	1.265[math]\displaystyle{ 1.15 \times 1.1 }[/math]
Armor Penetration
Indepentant of synergies, some equipment provides additional armor penetration to ASW attacks. The affected equipment are: DCR: Type 95 DC, Type 2 DC, Lightweight ASW Torpedo, Hedgehog, Type 2 DC K2 DCP: RUR-4A Weapon Alpha Kai, Mk.32 ASW Torpedo (Mk.2 Thrower). The flat armor penetration value is calculated as follows: [math]\displaystyle{ \text{Pen} = \sum\limits_{\text{Equipment}} \Big( \sqrt{\text{ASW}_\text{Equipment} - 2} + \text{Mod}_\text{ship} \Big) }[/math] With [math]\displaystyle{ \text{ASW}_\text{Equipment} }[/math] the base ASW stat of the applicable equipment, Visible Bonuses and Improvements are not counted here. [math]\displaystyle{ \text{Mod}_\text{ship} }[/math] being 1 for DE, 0 otherwise, Note Armor penetration from equipment stacks, The final armor of the targetted submarine cannot go below 1.

Notes

How To Obtain

Buildable

Stock equipment of: Amatsukaze Kai, Asashimo Kai, Kashima Kai, Kiyoshimo Kai, Makigumo Kai, Naganami Kai, Okinami Kai Ni (★+8), Shiranui Kai Ni

Upgradeable from: Type 93 Passive Sonar (★+3)

From quest: By6 (★+2, choice), B36, B72, B123 (choice), D43 (x2, choice)

From limited-time quest: 2103 LQ2 (choice), SB04, SB12, SB23 (choice), SB30 (choice), SB47 (x2, choice), 2110 LB01 (x2, choice), 21Fa LB01 (x2, choice), 22Fa LB02 (x6, choice), 22Fa LB04 (x2, choice)

Ranking reward for:

• May 2013: 1-20, 21-100, 101-200
• Jul 2013: 1-3, 4-20

Event reward for:

• Summer 2013 Event E-2
• Fall 2021 Event E-2: Casual (★+4)

Uses

Used to improve: Type 93 Passive Sonar, Type 3 Active Sonar, Type124 ASDIC, Type 3 Active Sonar Kai, Type 0 Passive Sonar

Used by quest: F103

Updates History

• 2013-06-03: Implemented as ranking reward
• 2013-08-26: Became buildable
• 2013-11-01: Stats increased: +6 +0 → +10 +2
• 2014-02-26: ASW synergy added
• 2015-01-09: Became improvable
• 2015-06-26: Bonus torpedo evasion from improvement added
• 2019-01-22: Visible bonuses added
• 2021-03-01: Visible bonuses added for Katori-class
  

Fit Bonuses

Type 3 Active Sonar Equipment Bonuses
Ship	Extra Requirement									Note
Kamikaze (any) Harukaze (any) Shigure (any) Yamakaze (any) Maikaze (any) Asashimo (any)	-	+1			+3				+2
Katori-class	(1st equipped)				+2				+3	One-time
Ushio (any) Ikazuchi (any) Yamagumo (any) Isokaze (any) Hamakaze (any) Kishinami (any)	-				+2				+2

Improvement

Type	Name	★	Resource							Day							2nd Ship	Note
										Sun	Mon	Tue	Wed	Thu	Fri	Sat
	Type 3 Active Sonar	0	10	0	30	50	4/5	2/3	-	I	X	I Y	I Y	X	X	X	Isuzu Kai Ni Yuubari
		6					5/7	3/5	1x
		10					-	-	-

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.75	1.06	1.29	1.50	1.67	1.83	1.98	2.12	2.25	2.37
	0.67	0.94	1.15	1.33	1.49	1.63	1.76	1.89	2.00	2.11
ASW	1.30	1.83	2.25	2.60	2.90	3.18	3.43	3.67	3.90	4.11
Torpedo	1.50	2.12	2.59	3.00	3.35	3.67	3.96	4.24	4.50	4.74