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Difference between revisions of "Anti-Submarine Warfare"
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− | |At least 1 base {{ASW}} ASW<ref>Here base {{ASW}} also include ASW gains from [[Modernization#ASW Modernization|ASW modding]] | + | |At least 1 base {{ASW}} ASW<ref>Here base {{ASW}} also include ASW gains from [[Modernization#ASW Modernization|ASW modding]] for [[Yamato Kai Ni]] so far, but not for [[Kaga|kaga Kai Ni/E]].</ref> |
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Revision as of 13:56, 8 February 2024
Submarines (SS, also including "Aircraft Carrying Submarines" SSV) are characterized by relatively low armor and HP. By contrast, they are difficult to handle using "normal setups", requiring instead specific Anti-Submarine Warfare (ASW) equipment and setups in order to be sunk.
During sorties, submarines are typically found at pre-boss nodes, but some can be boss themselves, see here.
Attack Behavior
Unlike regular surface ships, submarines:
- Cannot be targeted by normal shelling attacks,
- Are immune to air and torpedo attacks,
- Cannot take more than scratch damage during night battle,
- Therefore they cannot be sunk at night,
- The exception to this rule is when a battle starts at night, or when attacking with a Combined Fleet.
ASW Shelling Conditions
Only certain ships meeting certain conditions can attack SS(V).
- Most often, if a ship can attack a submarine, focusing it will take over any other target.
Ship | Conditions | Day Battle | Night Battle | |
---|---|---|---|---|
Stats | Equipment | |||
Taiyou-class Kai Ni![]() ![]() ![]() Kaga Kai Ni Go ![]() |
Not more than moderately damaged (中破) |
![]() ![]() |
Prioritize SS | Night Air Attack will prioritize surface target[3] Night Shelling prioritizes SS |
Gambier Bay Mk.II![]() |
Cannot attack SS unless if: setuped for a Night Air Attack, then prioritize SS with a night shelling attack | |||
All other CVL | Do not attack SS | |||
Mogami-class Kou Kai Ni![]() ![]() |
Prioritize surface target[4] | |||
BBV, CAV, AV, LHA | None | Equipped with ![]() ![]() ![]() ![]() ![]() ![]() |
Prioritize SS | |
Fusou-class Kai Ni![]() ![]() No.101 Transport Ship ![]() |
Equipped with ![]() |
Prioritize SS | ||
Any CV, CVL, BBV, CAV, AV, LHA | Not equipped with the above-mentioned equipment | Do not attack SS | ||
Hayasui Kai![]() Yamashio Maru Kai ![]() |
Equipped with ![]() |
Prioritize SS | Do not attack SS | |
Not equipped with ![]() |
Prioritize SS | |||
All other ships | At least 1 base ![]() |
None | ||
No base ![]() |
Do not attack SS |
- ↑ A 0
attack plane paired with a Rotorcraft
or a Liaison Aircraft
do work
- ↑ 2.0 2.1 2.2 If all relevant aircraft are in zero plane slots, the ship cannot attack SS.
- ↑ In absence of surface target will do a night shelling against SS
- ↑ Can still attack SS
- ↑ Here base
also include ASW gains from ASW modding for Yamato Kai Ni so far, but not for kaga Kai Ni/E.
- Notes
- As Abyssals also follow those conditions, SS/V can be used as "Submarine Tanks" (Sub-tanking) on some maps to deviate attacks from the fleet to the submarine.
Damage Calculation
The stats used to calculate damage against submarines is the ASW.
- When contributing to ASW power, Base
ASW is square rooted, while equipment ASW is multiplied by 1.5.
- Anti-submarine weaponry is therefore the primary source of ASW damage, with the base ship ASW playing a very minor role damage-wise.
- However, base ship ASW is the primary determinant of whether a ship can reach 100 total ASW to perform "Opening ASW" (OASW) attacks.
- Unlike sheeling, ASW damage is capped at 170.
ASW attacks have different modifiers gained from Formations,
- Line Abreast
is the main ASW formation, with a 1.3x damage modifier,
- Cruising Formation 1
is the main ASW formation for Combined Fleets, with a 1.3x damage modifier.
Anti-Submarine Formula | |||||||||
---|---|---|---|---|---|---|---|---|---|
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|
ASW Damage Synergy | |||
---|---|---|---|
![]() |
|||
![]() |
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![]() |
AP AP | ||
![]() |
AP AP AP AP AP | ||
![]() |
|||
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] | ![]() ![]() ![]() |
1.1 | |
![]() ![]() ![]() |
1.25 | ||
Examples | |||
[math]\displaystyle{ \text{Mod}_\text{synergy} }[/math] | ![]() ![]() ![]() |
1.4375[math]\displaystyle{ 1.15 \times 1.25 }[/math] | |
![]() ![]() ![]() |
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 flat armor penetration value is calculated as follows:
|
Opening ASW Shelling (OASW)
Commonly referred to as OASW (opening ASW). All eligible ships will perform a regular ASW Shelling attack, following range order in the same fashion as the First Shelling Phase. As these opening attacks happen before the Opening Torpedo Salvo, they may disable or even sink enemy submarines before they have a chance to attack.
OASW has the following trigger conditions:
- Only ships listed below can trigger an OASW,
- The ship is not required to be able to perform any ASW Shelling.
- They must meet their specific ASW stat threshold and requirements, listed below,
OASW Ship | ASW Stat Required[1] | Equipment Required[2][3][4] |
---|---|---|
Any DD, CL, CLT, CT, AO[5] | 100+ ASW | ![]() |
![]() ![]() ![]() |
![]() ![]() ![]() ![]() ![]() Sonar + Any Seaplane Bomber, or Rotorcraft, or Liaison Aircraft, or Dive Bomber, with 1+ ASW | |
![]() ![]() |
![]() ![]() ![]() ![]() Sonar + Seaplane Bomber, or Rotorcraft, or Depth Charge | |
Any CVL[6] | ![]() ![]() ![]() ![]() ![]() Sonar + Any with 1+ ASW | |
50+ ASW | ![]() ![]() ![]() ![]() Sonar + Any with 7+ ASW | |
65+ ASW | ![]() ![]() ![]() Any with 7+ ASW | |
Any DE | 60+ ASW | ![]() |
75+ ASW | Total of 4+ ASW from equipment | |
![]() ![]() ![]() Fletcher-class[7] John C. Butler-class Kai/Mk.II J-class Kai |
Can OASW innately | |
![]() ![]() ![]() ![]() |
N/A | ![]() ![]() ![]() ![]() Any with 1+ ASW |
![]() |
N/A | ![]() ![]() ![]() ![]() ![]() -or- ![]() ![]() ![]() |
- ↑ The Required ASW Stat does include Visible Bonuses, but does not include Improvements.
- ↑ Visible Bonuses or Improvements do not count as equipment ASW (e.g. a +6 ASW equipment with +1 ASW bonus does not count as a +7 equipment but just as a +6 one).
- ↑ When applicable, if all relevant ASW aircraft are in zero plane slots, and no bomber
/
with 1+
are present in non-zero plane slot, the ship cannot OASW.
- ↑ Regardless of their ASW stat,
Fighters or
Carrier Recons cannot trigger any OASW.
- ↑ Other ASW Shelling capable ships may be able to OASW, but cannot reach 100 ASW
using currently available equipment.
- ↑ CVE should be used, as they are the only CVL with base ASW
stat.
- ↑ Kai only for Heywood L. Edwards.
See the list of Anti-submarine Weaponry and ASW Aircraft to better see what can help achieve OASW on a given ship.
Abyssals
Abyssal ships do not follow these rules. The following may perform OASW unconditionally:
- Destroyer Ha-Class Late Model Elite
- Destroyer Ni-Class Late Model Elite
- Light Cruiser Tsu-Class Flagship
- Light Carrier Nu-Class (Elite III, Elite IV, all Kai Elite, all Kai Flagship)
- Ancient Destroyer Princess II
- Seaplane Tender Water Princess (all variants)
- Abyssal Kuriles Princess (all variants)
- Destroyer Forest Princess (Damaged variants unconfirmed)
Other abyssals cannot perform OASW.
Equipment Setups
Are listed here some recommended equipment setups for ASW duties. The equipment order is illustrative and does not reasonably matter. As general rules:
- The first priority is to have OASW, even at the expense of synergy:
- To further maximize ASW effectiveness, regardless if an OASW is triggered or not, it is recommended to use:
- When using carriers, it is recommended to use CVE, as they have a base
stat.
Equipment | Notes |
---|---|
DD/DE/CL/... | |
![]() ![]() ![]() ![]() |
This ASW setup maximizes the ASW by taking advantage of the synergy. One of the depth charges needs to be a Depth Charge Projector while the other needs to be a Depth Charge (Racks). Take note that reaching the OASW threshold takes precedence over everything. In this case, just replace depth charges with equipment that has a higher ASW. |
CVL/Kaga Kai Ni Go | |
![]() ![]() ![]() ![]() ![]() ![]() |
ASW Aircraft or just planes with good ASW should be prioritized. It is possible to maintain some surface combat capabilities, by doing a normal CVCI with high ASW panes, or by stacking ![]() |
Unique setup | |
![]() ![]() ![]() ![]() ![]() |
The ![]() ![]() ![]() Setup unique to Hyuuga Kai Ni |
LBAS
See the Land-Based Air Squadron page
- Only ASW Planes (7+
ASW) can attack submarine during this phase.
- If submarines are present, those planes will prioritize attacking submarines, while other attackers will only be able to attack surface targets.
ASW Aircraft | ||
---|---|---|
![]() |
Autogyros![]() ![]() ![]() |
|
Helicopters![]() ![]() |
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![]() |
||
![]() ![]() ![]() |
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+7 ASW ![]() ![]() |
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+7 ASW ![]() |
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+7 ASW ![]() |
Recons | |
Bombers |
ASW Support Expedition
- If a CVL is present, aircraft with
ASW will attack submarines regardless of the ship on which it's equipped.
See Also
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