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Difference between revisions of "Anti-Submarine Warfare"
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Revision as of 19:40, 6 April 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) |
with 1+[1][2] | 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 Bomber, , , , or with 1+[2] | 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 [2] | Prioritize SS | Do not attack SS | |
Not equipped with | Prioritize SS | |||
All other ships | At least 1 base ASW[5] | None | ||
No base ASW | 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 (only relevant for Yamato Kai Ni so far), excepted 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 shelling, 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 | |||||||||
---|---|---|---|---|---|---|---|---|---|
| |||||||||
|
ASW Damage Synergy | |||
---|---|---|---|
Small Small Sonars | |||
Large Large Sonars | |||
DCP Depth Charge Projectors (DCP) | AP AP | ||
DCR Depth Charge (Racks) (DCR) | AP AP AP AP AP | ||
Other ASW Mortars | |||
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 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 | 1 Sonar Equipped |
Kai Ni Juu |
+ Bomber / / / Sonar + Any Seaplane Bomber, or Rotorcraft, or Liaison Aircraft, or Dive Bomber, with 1+ ASW | |
+ Bomber / / 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 | 1 Sonar Equipped |
75+ ASW | Total of 4+ ASW from equipment | |
Kai Ni D Fletcher-class[7] John C. Butler-class Kai/Mk.II J-class Kai |
Can OASW innately | |
Kai Ni Go |
N/A | / / / Any with 1+ ASW |
N/A | 2 Autogyros -or- 1 Helicopter |
- ↑ 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)
- American Destroyer Princess (most variants)
Other abyssals cannot perform OASW.
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 | ||
---|---|---|
Rotorcraft | Autogyros |
|
Helicopters |
||
Liaison Aircraft | ||
Land-based Patrol Aircraft |
||
+7 ASW Torpedo Bombers | ||
+7 ASW Dive Bombers | ||
+7 ASW Seaplanes | 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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