View source for Equipment Bonuses

{{PortMechanicsPortal}}
[[file:Fit_bonus_example.png|thumb|right|One additional Firepower gained from equipping a 12.7cm Type C Gun Mount]]
Equipment Bonuses refer to specific ship-equipment combinations that trigger a modification in some specific '''[[Stats]]''' with values referred to as "Fit Bonuses". 
*These are displayed in the game by a {{TextGlow|'''↑+'''|black|text-colour=cyan|glow-size=1px}} or {{color|red|'''↓-'''}} symbol in front of each applicable stat.
*Some of those bonuses may:
**Synergize, being greater when being combined with other equipment,
**Be affected by [[Improvement#Visible Fit Bonuses|improvements]], the number of stars {{Star}} improving the bonuses.

*These bonuses must not be confused with the '''"[[Hidden Fit Bonuses]]"''', to Accuracy and Firepower. 
**To differentiate with "hidden Fit Bonuses", they are also referred to as '''"Visible Fit Bonuses"'''.

=Fit Bonus Specifics=
Although displayed in the game, some Fit Bonuses have an erroneous effect or outright do not work.

Visible fits will always work for raw stat requirements such as for [[Expeditions]], but some may not work as intended in formulas used in sorties.

As of 28 April 2022, the following Fit Bonuses present issues.

==Functional==
These Fit Bonuses work in every scenario:
* {{Evasion}} '''Evasion'''.
* {{Armor}} '''Armor'''.
* {{Speed}} '''Speed'''.
* {{Range}} '''Range'''.
**"[[Combat/Day Battle#First_Shelling_Phase|Longest Range]]" is only displayed as "Very Long Range", but still works as intended.

===Formulas===
* {{Firepower}} '''Day Surface Shelling''' - All {{Firepower}} Firepower fits work as intended.
* {{Firepower}}{{Torpedo}} '''Night Surface Shelling''' - All fits work as intended.
** Especially for [[Ark Royal]] and {{Equipment/Link|Swordfish|Swordfish Mk.II (Skilled)|Swordfish Mk.III (Skilled)|text=Swordfish-series}}, the torpedo stat does not work.
* {{Firepower}}{{Torpedo}}{{Dive}} '''Carrier Shelling''' - All fit sources work as intended. The {{Torpedo}} Torpedo fit will now be included for shelling power calculation <!--04/08/2021-->
* {{Torpedo}}{{Dive}} '''Airstrike''' - The fits given by the {{Equipment/Link|Skilled Deck Personnel + Aviation Maintenance Hands}} works as intended.
* {{Torpedo}} '''Torpedo Attacks''' - All {{Torpedo}} Torpedo fits work as intended.
** This includes fits provided by sources that are not torpedoes, such as seaplanes and lookouts.

==Partially functional==
These Fit Bonuses have at least one situation in which they don't work as intended:

* {{LOS}} '''LoS''': Bonuses count as ship base LoS and not equipment, for routing purposes. No effect for artillery spotting.<ref>https://twitter.com/Matsu_class_DD/status/1245457218956226560</ref>

* {{Acc}} '''Accuracy''': 
** Works for shelling phases<ref>https://twitter.com/noratako5/status/1252194958456483840</ref>.
** Does not work for [[Support Expedition]]<ref>https://twitter.com/chang1124414276/status/1242332458936197120</ref>.

===Formulas===
* {{ASW}} '''Anti-Submarine Shelling''': All {{ASW}} ASW fits work as intended, both towards damage and OASW ship stat thresholds.
** This includes fits provided by sources that don't count towards ASW damage, such as Reconnaissance Seaplanes & Carrier-Based Fighter Aircraft.
** '''Does not count''' for the following cases:
*** Equipment ASW for equipment stat [[OASW]] thresholds. E.g. A plane with 6 base ASW & a 1 ASW fit does not count as a 7asw plane.
*** Damage of [[Night_Battle#Carrier_Night_Attacks|Carrier Night Attacks]] [https://twitter.com/SZRandomness/status/1144649656091021312].
*** Damage of [[Support Expedition|ASW Support]] [https://twitter.com/myteaGuard/status/1445411574655578116].
*** The [[Anti-Submarine_Warfare#Damage_Calculation|Armor Penetration]] of depth charge [https://twitter.com/yukicacoon/status/1555201349817876480].

* {{AA}} '''Anti-Air''': Works for [[Aerial_Combat#Stage_2_-_Fleet_Anti-Air_Defense|Air Defense Phase]].
** However bonus granted to aircraft does not contribute to Air Power<ref>https://twitter.com/Grunilg/status/1555148831146352641?t=KZISfW3SJ5W0kimXEB-VQQ&s=19</ref>.

* {{Torpedo}} '''Airstrike''' - The fits given by aircraft affect only one plane and do not works in some situation.
* {{Dive}} '''Airstrike''' - Does not works.

* {{Firepower}}{{Torpedo}}{{Dive}}{{ASW}} '''Night Carrier Cut-in Attack''': Only of the {{Torpedo}}{{Dive}} fits of {{Equipment/Link|Skilled Deck Personnel + Aviation Maintenance Hands}} work<ref>https://twitter.com/yukicacoon/status/1566971952576995328?s=20&t=YjkxkRBOxuhGEbss63ogaA</ref><ref>https://twitter.com/shiro_sh39/status/1255895548898361346</ref><ref>https://twitter.com/SZRandomness/status/1144649656091021312</ref>.
** Additionally, any base {{Firepower}}{{Torpedo}}{{Dive}} granted by equipment other than night plane provide not increase damage for this formula<ref>https://twitter.com/SZRandomness/status/1144649656091021312</ref><ref>https://twitter.com/yukicacoon/status/1566971952576995328?s=20&t=YjkxkRBOxuhGEbss63ogaA</ref>.

=Explanation=
Fit Bonuses are not considered a part of an equipment's stat, and are instead added to the ship's actual stat directly. This is what leads to inconsistencies in the formulas.

The displayed value in a given stat is given by:

<math>\text{Final Value} = \text{Base Stat} + \text{Equipment Stat} + \text{Fit Bonus}</math>

'''Where:'''
* Final Value is the displayed Value in the ship card.
* Base Stat is the stat without '''any equipment'''.
* Equipment Stat is the equipments '''displayed stat'''.
* Fit Bonus is the added value to the stat by '''fits'''.

Some formulas, such as {{Firepower}} Surface Shelling, {{Torpedo}}Opening/Closing Torpedo Salvos, and {{Firepower}} Carrier Shelling use the Final Value. In those cases, the fit bonuses work as intended.

However, other formulas break down the stats for various reasons (mainly for applying different weighting to equipment, as in {{ASW}}ASW and {{AA}}Anti-Air formulas, or using other parameters like the {{Acc}}Accuracy formula), and instead use '''Base Stat''' and the sum of '''Equipment Stats''' instead. In those cases, '''Fit Bonus''' is not used anywhere in the formula, and therefore does not work.

==Airstrike==
There are two completely independent systems for {{Torpedo}} torpedo and {{Dive}} dive bombing fit bonuses affecting airstrike damage:
*The fits given by the {{Equipment/Link|Skilled Deck Personnel + Aviation Maintenance Hands|text=SDP+}},
*The fits given by aircraft equipment.
As they are independent the effects of both systems stack.

===Skilled Deck Personnel + Aviation Maintenance Hands===
* {{Torpedo}} fits affect equally all {{Torpedo Bomber}} equipped on the ship,
* {{Dive}} fits affect equally all {{Dive Bomber}}, {{JetFighterBomber2}}/{{JetFighterBomber1}} and {{SPB}} equipped on the ship,
** The fits does work during the [[Jet Assault]].

===Planes===
If one or multiple planes have {{Torpedo}} fits, only one is chosen based on a priority order. The fits given by this plane are then applied to the equipped attack plane ({{Torpedo Bomber}}/{{Dive Bomber}}/{{JetFighterBomber2}}/{{JetFighterBomber1}}/{{SPB}}) with the highest {{Torpedo}}/{{Dive}}.
*Note that if the fit is +0{{Torpedo}} for the current ship it will still be chosen and then give 0{{Torpedo}}.
* If there is a tie in the highest {{Torpedo}}/{{Dive}} the plane with the highest slot size is chosen. If there is also a tie in slot size then the first plane in the equipment order is chosen.
** The fits does '''not''' work during the [[Jet Assault]].
The priority list
{|class="wikitable"
!Priority!!Planes!!Note
|-
|1||{{SPR}} [[Type 0 Small Reconnaissance Seaplane]]<br>{{SPR}} [[Type 0 Small Reconnaissance Seaplane (Skilled)]]||Stackable
|-
|2||{{SPR}} [[Type 0 Reconnaissance Seaplane Model 11B]]<br>{{SPR}} [[Type 0 Reconnaissance Seaplane Model 11B (Skilled)]]||One-time
|-
|3||{{SPR}} [[Shiun (Skilled)]]||Stackable
|-
|4||{{SPR}} [[Shiun]]||Stackable
|-
|5||{{SPB}} [[Swordfish Mk.III Kai (Seaplane Model)]]||One-time
|-
|6||{{SPB}} [[Swordfish Mk.III Kai (Seaplane Model/Skilled)]]||One-time
|-
|7||{{Torpedo Bomber}} [[Tenzan Model 12A]]||One-time
|-
|8||{{Night Torpedo Bomber}} [[Tenzan Model 12A Kai (w/ Type 6 Airborne Radar Kai)]]||One-time
|-
|9||{{Night Torpedo Bomber}} [[Tenzan Model 12A Kai (Skilled w/ Type 6 Airborne Radar Kai)]]||One-time
|-
|10||{{Torpedo Bomber}} [[Barracuda Mk.III]]||Stackable
|-
|11||{{Torpedo Bomber}} [[Barracuda Mk.II]]||Stackable
|}
;Notes
* If multiple planes with the same priority order are equipped, then their bonuses stack.
** If a bonuse is one-time it cannot stack.
* The priority of the {{Night Torpedo Bomber}} [[Tenzan Model 12A Kai (Skilled w/ Type 6 Airborne Radar Kai)]] is not confirmed due to a lack of data.

;Example
# For a [[Shoukaku Kai Ni A]] equipped with:
#* {{Torpedo Bomber}} [[Tenzan Model 12A]] with +1{{Torpedo}} fits
#* {{Night Torpedo Bomber}} [[Tenzan Model 12A Kai (w/ Type 6 Airborne Radar Kai)]] with +2{{Torpedo}} fits
#* The resulting fits will be +1{{Torpedo}} because the {{Torpedo Bomber}} [[Tenzan Model 12A]] has a higher priority.
# For a [[Gotland Andra]] equipped with:
#* {{SPR}} [[Shiun (Skilled)]] with +0{{Torpedo}} fits
#* {{SPB}} [[Swordfish Mk.III Kai (Seaplane Model/Skilled)]] with +3{{Torpedo}} fits
#* The resulting fits will be +0{{Torpedo}} because the {{SPR}} [[Shiun (Skilled)]] has a higher priority.
# For a [[I-14 Kai]] equipped with:
#* {{SPR}} [[Type 0 Small Reconnaissance Seaplane (Skilled)]] with +3{{Torpedo}} fits
#* {{SPR}} [[Type 0 Small Reconnaissance Seaplane]] with +1{{Torpedo}} fits
#* {{SPB}} [[Swordfish Mk.III Kai (Seaplane Model/Skilled)]] with +0{{Torpedo}} fits
#* The resulting fits will be +4{{Torpedo}} because the {{SPR}} [[Type 0 Small Reconnaissance Seaplane]] and the {{SPR}} [[Type 0 Small Reconnaissance Seaplane (Skilled)]] have the same priority.

''Source: [https://x.com/Divinity_123/status/1854937456086311200]

==Fixed==
* {{LOS}} '''LoS''': [[SG Radar (Initial Model)]] did not contribute for any calculation<ref>https://twitter.com/CC_jabberwock/status/1089154587628466177</ref>.
** It was fixed with the introduction of the [[SG Radar (Late Model)]].
* {{ASW}} '''ASW''': ''28/09/2021'' Global ASW bonus fixes<ref>https://discord.gg/RtSadWM https://discord.com/channels/118339803660943369/425302689887289344/892404611137302538</ref>.
* {{AA}} '''AA''': [[Game Updates/2022/August 4th|04/08/2022]] update
* {{Speed}} '''Speed''': The [[Houshou|Houshou Kai Ni/Sen]] bonus didn't work properly on implementation.

=Display Bugs=
Some bonus preview values, as displayed with {{TextGlow|'''↑+'''|black|text-colour=cyan|glow-size=1px}} on the equipment card, are inconsistent with the ship's stat totals after equipping the equipment. In such cases, the ship's stat totals reflect the actual correct values used in battle calculations<ref>https://twitter.com/CC_jabberwock/status/1756634228954112168</ref>, whereas the preview values are visual bugs.

{|class="wikitable mw-collapsible mw-collapsed" style="width:100%; text-align: center; vertical-align: middle;"
! colspan="100" | {{GreenGunDP}}{{EquipmentLink|8cm High-angle Gun}}
|-
! style="width: 20%;" | Ship
! style="width: 20%;" | Extra Requirement
! style="width: 5%; background-color: lightcoral;" | {{Firepower}}
! style="width: 5%; background-color: lightskyblue;" | {{Torpedo}}
! style="width: 5%; background-color: sandybrown;" | {{AA}}
! style="width: 5%; background-color: #9C8FEE;" | {{ASW}}
! style="width: 5%; background-color: #7fffd4;" | {{LOS}}
! style="width: 5%; background-color: #F2E279;" | {{Armor}}
! style="width: 5%; background-color: darkseagreen" | {{Accuracy}}
! style="width: 5%; background-color: violet;" | {{Evasion}}
! style="width: 20%;" | Note
|-
! colspan="100" | Preview Values
|-
! {{ShipLink|Mogami Kai Ni|Mogami Kai Ni Toku|text=Mogami Kai Ni /Toku}}
| style="text-align:left;" | -
| +1 ||  || +4 ||  ||  ||  ||  || +3
| rowspan="3" style="text-align:left;" | ''(bug introduced 2024-01-25)''
|-
! {{ShipLink|Mikuma Kai Ni|Mikuma Kai Ni Toku|text=Mikuma Kai Ni /Toku}}
| style="text-align:left;" | -
|  ||  || +2 ||  ||  ||  ||  || +1
|-
! {{ShipLink|Noshiro Kai Ni}}<br>{{ShipLink|Yahagi Kai Ni|Yahagi Kai Ni B|text=Yahagi Kai Ni /B}}
| style="text-align:left;" | -
|  ||  || 0 ||  ||  ||  ||  || 0
|-
! colspan="100" | Actual Values
|-
! {{ShipLink|Mogami Kai Ni|Mogami Kai Ni Toku|text=Mogami Kai Ni /Toku}}<br>{{ShipLink|Mikuma Kai Ni|Mikuma Kai Ni Toku|text=Mikuma Kai Ni /Toku}}
| style="text-align:left;" | -
| +1 ||  || +2 ||  ||  ||  ||  || +2
| style="text-align:left;" | 
|-
! {{ShipLink|Noshiro Kai Ni}}<br>{{ShipLink|Yahagi Kai Ni|Yahagi Kai Ni B|text=Yahagi Kai Ni /B}}
| style="text-align:left;" | -
|  ||  || +2 ||  ||  ||  ||  || +1
| style="text-align:left;" | 
|}

{|class="wikitable mw-collapsible mw-collapsed" style="width:100%; text-align: center; vertical-align: middle;"
! colspan="100" | {{GreenGunDP}}{{EquipmentLink|8cm High-angle Gun Kai + Additional Machine Guns}}
|-
! style="width: 20%;" | Ship
! style="width: 20%;" | Extra Requirement
! style="width: 5%; background-color: lightcoral;" | {{Firepower}}
! style="width: 5%; background-color: lightskyblue;" | {{Torpedo}}
! style="width: 5%; background-color: sandybrown;" | {{AA}}
! style="width: 5%; background-color: #9C8FEE;" | {{ASW}}
! style="width: 5%; background-color: #7fffd4;" | {{LOS}}
! style="width: 5%; background-color: #F2E279;" | {{Armor}}
! style="width: 5%; background-color: darkseagreen" | {{Accuracy}}
! style="width: 5%; background-color: violet;" | {{Evasion}}
! style="width: 20%;" | Note
|-
! colspan="100" | Preview Values
|-
! {{ShipLink|Mogami Kai Ni|Mogami Kai Ni Toku|text=Mogami Kai Ni /Toku}}
| style="text-align:left;" | -
| +2 ||  || +7 ||  ||  ||  ||  || +5
| rowspan="3" style="text-align:left;" | ''(bug introduced 2024-01-25)''
|-
! {{ShipLink|Mikuma Kai Ni|Mikuma Kai Ni Toku|text=Mikuma Kai Ni /Toku}}
| style="text-align:left;" | -
| +1 ||  || +5 ||  ||  ||  ||  || +3
|-
! {{ShipLink|Noshiro Kai Ni}}<br>{{ShipLink|Yahagi Kai Ni|Yahagi Kai Ni B|text=Yahagi Kai Ni /B}}
| style="text-align:left;" | -
| +1 ||  || +3 ||  ||  ||  ||  || +2
|-
! colspan="100" | Actual Values
|-
! {{ShipLink|Mogami Kai Ni|Mogami Kai Ni Toku|text=Mogami Kai Ni /Toku}}<br>{{ShipLink|Mikuma Kai Ni|Mikuma Kai Ni Toku|text=Mikuma Kai Ni /Toku}}
| style="text-align:left;" | -
| +2 ||  || +5 ||  ||  ||  ||  || +4
| style="text-align:left;" | 
|-
! {{ShipLink|Noshiro Kai Ni}}<br>{{ShipLink|Yahagi Kai Ni|Yahagi Kai Ni B|text=Yahagi Kai Ni /B}}
| style="text-align:left;" | -
| +1 ||  || +5 ||  ||  ||  ||  || +3
| style="text-align:left;" | 
|}

{|class="wikitable mw-collapsible mw-collapsed" style="width:100%; text-align: center; vertical-align: middle;"
! colspan="100" | {{Amphibious Tank}}{{EquipmentLink|Special Type 4 Amphibious Tank}}
|-
! style="width: 20%;" | Ship
! style="width: 20%;" | Extra Requirement
! style="width: 5%; background-color: lightcoral;" | {{Firepower}}
! style="width: 5%; background-color: lightskyblue;" | {{Torpedo}}
! style="width: 5%; background-color: sandybrown;" | {{AA}}
! style="width: 5%; background-color: #9C8FEE;" | {{ASW}}
! style="width: 5%; background-color: #7fffd4;" | {{LOS}}
! style="width: 5%; background-color: #F2E279;" | {{Armor}}
! style="width: 5%; background-color: darkseagreen" | {{Accuracy}}
! style="width: 5%; background-color: violet;" | {{Evasion}}
! style="width: 20%;" | Note
|-
! colspan="100" | Preview Values
|-
! rowspan="3" | All [[SS]]/[[SSV]]
| style="text-align:left;" | '''(★2+) + {{EquipmentLink|Special Type 4 Amphibious Tank Kai|text=★2+ Special Type 4 Amphibious Tank Kai}}'''
| +1 ||  ||  ||  ||  ||  ||  || 
| rowspan="3" style="text-align:left;" | ''(bug introduced 2024-02-29)''<br>Additionally to other bonuses omitted from this table
|-
| style="text-align:left;" | '''(★4+) + {{EquipmentLink|Special Type 4 Amphibious Tank Kai|text=★4+ Special Type 4 Amphibious Tank Kai}}'''
|  || +1 ||  ||  ||  ||  ||  || 
|-
| style="text-align:left;" | '''(★8+) + {{EquipmentLink|Special Type 4 Amphibious Tank Kai|text=★8+ Special Type 4 Amphibious Tank Kai}}'''
| +1 ||  ||  ||  ||  ||  ||  || 
|-
! colspan="100" | Actual Values
|-
! rowspan="3" | All [[SS]]/[[SSV]]
| style="text-align:left;" | '''(★2+) + {{EquipmentLink|Special Type 4 Amphibious Tank Kai|text=★2+ Special Type 4 Amphibious Tank Kai}}'''
| 0 ||  ||  ||  ||  ||  ||  || 
| style="text-align:left;" | 
|-
| style="text-align:left;" | '''(★4+) + {{EquipmentLink|Special Type 4 Amphibious Tank Kai|text=★4+ Special Type 4 Amphibious Tank Kai}}'''
|  || 0 ||  ||  ||  ||  ||  || 
| rowspan="2" style="text-align:left;" | Unconfirmable in-game, but suspected based on ★2
|-
| style="text-align:left;" | '''(★8+) + {{EquipmentLink|Special Type 4 Amphibious Tank Kai|text=★8+ Special Type 4 Amphibious Tank Kai}}'''
| 0 ||  ||  ||  ||  ||  ||  || 
|}

=References=
<references/>

=See Also=
*[[Stats]]
*[https://docs.google.com/spreadsheets/d/1bInH11S_xKdaKP754bB7SYh-di9gGzcXkiQPvGuzCpg "Equipment visible bonus" spreadsheet]
*[[Combat/Overweight Penalty and Fit Gun Bonus]]

{{Mechanics}}
{{Equipmentlist}}