Installations are an enemy-type representing "land-based installations", and are characterized by high armor and high HP. They are difficult to handle using normal anti-ship setups and require specific setups in order to be destroyed. Installations are typically found as bosses or as boss escorts.

General Characteristics

They cannot be targeted by torpedoes.
- Opening and closing torpedoes will fail to trigger if only installation targets remain.
The torpedo stat is ignored when calculating night battle damage against installations. Please see Night Battle for more details.
- This makes destroyers, light cruisers, and heavy cruisers much weaker unless equipped with anti-installation equipment.
Submarines can attack installations during shelling if equipped with a Special Type 2 Amphibious Tank .
- They will be able to attack installations at night regardless of equipment.
- Their low firepower makes them poor anti-installation ships.
Only dive bombers will attack installations during the air strike phase.

Dive-Bombers that can attack installations
Carriers will only attack installations in the shelling phase if equipped with Torpedo Bombers or Anti-Installation Dive Bombers. Additionally, carriers will attack installations if equipped with non-special dive bombers AND one of the special dive bombers below. Any other dive bomber will completely disable shelling against installations even if the carrier has a torpedo bomber equipped. This can be very useful to manipulate the targeting mechanic so the carriers attack important targets.
Ju 87C Kai Prototype Nanzan F4U-1D FM-2 Ju 87C Kai Ni (w/ KMX) Ju 87C Kai Ni (w/ KMX/Skilled) Suisei Model 12 (634 Air Group w/ Type 3 Cluster Bombs) AAR Suisei Model 12 (w/ Type 31 Photoelectric Fuze Bombs) AAR Type 99 Dive Bomber Model 22 Type 99 Dive Bomber Model 22 (Skilled) SB2C-3 SB2C-5 F4U-4 AAR

Carriers are unable to perform cut-ins on installations, even if equipped with anti-installation dive bombers.
They have different damage statuses instead of the normal ones used for ships.

Ship Damage Label	Installation Damage Label
Lightly Damaged (小破)	Confused (混乱)
Moderately Damaged (中破)	Damaged (損害)
Heavily Damaged (大破)	Broken (損壊)
Sunk (撃沈)	Destroyed (破壊)

Installation Classification

Installations are classified by two categories: Ship Type (BB, BBV, CV) and Toughness (Soft Skin or Hard Skin).

Ship Type

Type	Characteristics
Battleship (BB)	Examples are Artillery Imps and Central Princess . Uses the surface shelling formula for calculating damage. Uses the shelling attack animation in day and night battle. Can continue attacking when moderately damaged.
Aviation Battleship (BBV)	Most installations fall under this category. Uses the carrier attack formula for calculating damage. Uses the shelling attack animation in day and night battle. Cannot attack during the day if heavily damaged or if there are no planes left. Forced to attack submarines if they have equipment with Anti-Submarine stat.
Carrier (CV)	Example is Lycoris Princess . Uses the carrier attack formula for calculating damage. Uses the carrier attack animation in day battle and the shelling animation at night. Cannot attack during the day if moderately damaged or if there are no planes left. Do not enable the 2nd shelling phase if there is no battleship present.

Skin Toughness

Type	Characteristics
Soft Skin	Examples are Supply Depot Princess , Harbour Princess and Northern Princess . Takes a lot of damage from Anti-Aircraft Shells and less from other Anti-Installation equipment. This weakness allows battleships and heavy cruisers to easily deal with these installation types. Still takes a decent amount of damage from other anti-installation equipment. Supply Depot Princess has extra Post-Cap modifiers.
Hard Skin	Examples are Isolated Island Demon , Artillery Imp , and Harbour Summer Princess . Takes more damage from Anti-Installation equipment like Landing Crafts, Amphibious Tanks and Anti-ground Artillery

Damage Calculation

During day, damage is capped at 220 so any ship with a proper anti-installation setup will be able to hit the cap.
- When facing hard-skinned installations, it is better for battleships to have AP shells instead of Type 3 because they will hit the day cap anyway.
Anti-installation is very important during night battle when the cap is raised to 360.
Torpedo stat is always counted as 0 when attacking installations. This applies to both airstrikes and night battles.
- However improvement that give "Yasen" is taken into account.
Supply Depot Princess is the only known installation that takes post-cap damage from anti-installation equipment.
- This makes her vulnerable to getting one shot by nuke setups. See below for details.
While dive bombers have a post-cap bonus during the air-strike, the low base damage means it is of limited effectiveness against high armor installations.
The Armor Percing modifier (post-cap) is effective against installation.

Calculation

Installation generaly have a lot of HP and/or armor. But there is multiple different cumulative bonuses against them that allow to do massive damage. If you have the good equipment set-up. These bonuses are divided into 5 groups and are calculated in the following order:

Ship type bonuses
General mutiplicative bonuses
Specific equipment bonuses:
1. 11th regiment bonuses
2. M4A1 bonuses
3. Ho-Ni bonuses
4. Landing craft synergy bonuses
5. General additive bonuses
Post-cap bonuses against Supply Depot Princess

Bonuses

Pre-cap:

[math]\displaystyle{ \text{Atk}_\text{pre-cap} = \Big[ \Big( \big[ ( \text{Atk}_\text{base} {\color{tomato} \times \text{A0}} {\color{DeepSkyBlue} + \text{B0}} ) {\color{tomato} \times \text{A1}} {\color{DeepSkyBlue} + \text{B2}} \big] {\color{tomato} \times \text{A21}} {\color{DeepSkyBlue} + \text{B21}} \Big) {\color{tomato} \times \text{A23}} {\color{DeepSkyBlue} + \text{B23}} \Big] {\color{tomato} \times \text{A24}} {\color{DeepSkyBlue} + \text{B24} + \text{B3}} }[/math]

Cap

[math]\displaystyle{ \text{Atk}_\text{cap} = \text{Cap} \times \sqrt{\text{Atk}_\text{pre-cap} - \text{Cap}} }[/math]

Post-cap:

[math]\displaystyle{ \text{Atk}_\text{post-cap} = \text{Atk}_\text{cap} {\color{tomato} \times \text{C}} {\color{DeepSkyBlue} + \text{D}} }[/math]

With:

[math]\displaystyle{ \text{Atk}_\text{base} }[/math] the base attack deffined here,
A & C the multiplicative bonuses,
B & D the additive bonuses,
A & B being pre-cap bonuses,
C & D being post-cap bonuses.

Main Bonuses

Installation Type	Soft-Skinned		Isolated Island Princess		Artillery Imp		Harbour Summer Princess		Supply Depot Princess (Post Cap)
Number Equipped	Single	Multiple	Single	Multiple	Single	Multiple	Single	Multiple	Single	Multiple
AA Shells	2.5		1.75				1.75
AP Shells					1.85		1.3
WG42 (Wurfgerät 42)	1.3	1.82	1.4	2.1	1.6	2.72	1.4	1.68	1.25	1.625
Anti-Ground Rocket Launcher	1.25	1.875	1.3	2.145	1.5	2.7	1.25	1.75	1.2	1.68
ASW Mortars	1.2	1.56	1.2	1.68	1.3	1.95	1.1	1.265	1.15	1.38
Landing Craft Type Multiplier	1.4		1.8		1.8		1.7		1.7
Landing Craft Improvement Multiplier	1 + (Average ★ /50) [Max 1.2x]								Apply again (Twice if T89/HoNi)
Toku Daihatsu Landing Craft	1.15		1.15		1.15		1.2		1.2
Daihatsu Landing Craft (Type 89 Medium Tank & Landing Force)	1.5	1.95	1.2	1.68	1.5	2.1	1.6	2.4	1.3	2.08
Toku Daihatsu Landing Craft + Type 1 Gun Tank (HoNi)	Counted as Type 89 Medium Tank & Landing Force
Daihatsu Landing Craft (Panzer II/North African Specification)	1.5		1.2		1.5		1.6		1.3
Toku Daihatsu Landing Craft + 11th Tank Regiment	1.8		1.8		1.8		1.8
M4A1 DD	1.1		1.8		2.0		2.0		1.2
Armed Daihatsu + Soukoutei (AB)	1.1	1.21	1.3	1.43	1.3	1.43	?		1.5	1.65
Special Type 2 Amphibious Tank	1.5	1.8	2.4	3.24	2.4	3.24	2.8	4.2	1.7	2.55
Amphibious Tank Improvement Multiplier	1 + (Average ★ /30) [Max 1.33x]								1 + (Average ★ /30) [Max 1.33x]
Carrier-based Dive Bomber			1.4		1.5		1.3
/ Seaplane Bombers/Fighters	1.2				1.5		1.3
Destroyer / Light Cruiser (DD/CL)					1.4
Airstrike-Only Multipliers
Land Based Attack Aircraft			1.18		1.6				2.1
Bombers (Post cap)			1.7		1.55

Notes

With the exception of Post-cap and the LHA Bonus, the Armed Daihatsu + Soukoutei (AB) bonus only applies in Daytime combat. (Landing Craft type bonus still functions at night)

The following multipliers are pre-cap, but are applied after Flat Damage Bonuses from Toku Daihatsu Landing Craft and M4A1 DD are added:

If M4A1 DD is Equipped
Pre-Cap Bonus	1.4
If Armed Daihatsu + Soukoutei (AB) are both Equipped
Equipment	Single	Multiple
IJN Landing Craft	1.2
Group A	1.1	1.32
Group B	1.2	1.32

Maximum Group Bonus	1.32

Flat Damage Bonuses

Amount Equipped	1	2	3	4
WG42 (Wurfgerät 42)	75	110	140	160
Shipborne Model Type 4 20cm Anti-ground Rocket Launcher	55	115	160	190
Type 4 20cm Anti-ground Rocket Launcher (Concentrated Deployment)	80	170	?	?
Type 2 12cm Mortar Kai	30	55	75	90
Type 2 12cm Mortar Kai (Concentrated Deployment)	60	110	150	180
Toku Daihatsu Landing Craft + 11th Tank Regiment	25
M4A1 DD	25
Armed Daihatsu + Soukoutei (AB) (Both Equipped)	10
Ship Type Bonus
Submarine (SS/SSV)	30
Airstrike-only Bonus
Bombers (Supply Depot Princess Only)	100 (Post-cap)

Notes:

With the exception of the bomber bonus, Flat damage bonuses are pre-cap

Equipment Setups

Below are recommended equipment setups for anti-installation. If a setup is not listed, it means that it is subpar and not worth considering. The order of the equipment is for illustrative purposes only. It does not matter what order the equipment are in.

Battleships
Equipment Setup	Notes
	This setup is the basic setup for battleships. Because battleships can hit the damage cap easily, they do not benefit much from anti-installation equipment. The standard artillery spotting setup will allow them to be effective against all other targets including the installation.
	This is an option where you will be facing soft-skinned installations. Taking a Type 3 shell will limit the battleship's effectiveness against all other targets. Careful consideration must be made into whether it is worth it.
/	An alternative setup for Nagato Kai Ni and Mutsu Kai Ni. The landing craft/amphibious tank will make their Touch attacks deal significant damage to installation enemies. Keeping the seaplane, allows them to perform artillery spotting to maintain some effectivenes against other targets.
	This is a unique setup available to Musashi Kai Ni that allows her to have the best of both worlds.
Heavy Cruisers
Equipment Setup	Notes
	This is the standard anti-installation setup for all heavy cruisers. It allows them to artillery spot and deals decent damage against installations.
	This is an alternative setup only for aviation cruisers. It removes the ability to artillery spot for much more powerful anti-installation damage at night.
Light Cruisers
Equipment Setup	Notes
	This is the standard "nuke" setup. It has powerful anti-installation power against all installations but is hampered by the daytime damage cap. It performs best at night or when up against Supply Depot Princess.
	An alternative setup for 4-slot light cruisers. This preserves their ability to double attack at night while giving them significant anti-installation power.
Destroyers^[1]
Equipment Setup	Notes
	Same as the "nuke" setup used by light cruisers. It has powerful anti-installation power against all installations but is hampered by the daytime damage cap. It performs best at night or when up against Supply Depot Princess.
/	This is an alternative setup that preserves their ability to double attack at night while maintaining decent anti-installation power. This setup works best if the Landing Craft or Amphibious Tanks are upgraded to maximise damage. It also allows them to perform well against non-installation targets at night.
/	An alternative "nuke" setup if you are lacking Landing Craft or Amphibious Tanks. It will still deal significant damage to Supply Depot Princess.
	This setup is currently unique to Tashkent. It functions much like the light cruiser setup with a powerful night battle double attack.
Carriers/Light Carriers
Equipment Setup	Notes
	This is only to be used if you have one of the anti-installation dive bombers. It will allow the carrier to still perform CVCI against other targets.
	The numbers of torpedo bombers and fighters in this setup can be varied depending on the amount of fighter power required. This is the standard carrier anti-installation setup. While it does sacrifice CVCI, the carrier shelling formula and proficiency bonuses still ensure that carriers will do significant damage to installations and other targets.
Seaplane Tenders
Equipment Setup	Notes
	Same "nuke" setup used by light cruisers. For 4-slot AVs, they can either take a 2nd anti-ground rocket or a seaplane fighter as the wild card. It has powerful anti-installation power against all installations but is hampered by the daytime damage cap. It performs best at night or when up against Supply Depot Princess.

↑ High-angle main guns can stand in for the small-caliber main guns.

Additional Information

Landing Craft/Amphibious Tank Capable Ships

Ships that can equip Landing Craft / Amphibious Vehicles
Type	Landing Craft	Both &	Amphibious Vehicle
DD		Kai Ni D Kai Ni D Kai Ni D Kai Ni D	Kai Ni

CL		Kai Ni D Kai Ni Toku

CAV		Kai Ni Toku

(F)BB(V)		Kai Ni Juu	Kai Ni C

CVL		Kai Ni Sen

AV		Kai Ni Toku

AO

LHA

SS(V)			All

RE	Soukoutei (Armored Boat Class) : Shinshuu Maru Ka-Tsu tanks : I-36 · I-41 · I-47 Kai · I-58 Kai
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Combat/Anti-Installation

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