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Combat/Opening Anti-Submarine Warfare
Introduction
During the opening phases of combat, ships which meet certain requirements are able to perform opening ASW attacks. These attacks are valuable because they have the opportunity to sink submarines before they get the chance to perform opening torpedoes.
Overview
1. All ships with an ASW 
stat are capable of performing OASW.
- Theoretically any ship capable of ASW is able to perform OASW but no equipment exists that allows normal CVL, CAV and BBV to hit the 100 ASW threshold.
2. Upgrades to ASW equipment are not counted towards the thresholds for triggering OASW.
3. OASW attacks are performed in range order.
- Attacks from ships with the same range are random.
4. Damage is calculated the same way as normal ASW.
5. You can modernise a ship's ASW using destroyer escorts. Please see Modernization for more details.
Trigger Requirements
| Ship | Requirement |
|---|---|
| All ASW capable ships |
|
| Destroyer Escorts |
Either:
|
| Isuzu Kai Ni Tatsuta Kai Ni Jervis Kai Janus Kai Samuel B. Roberts Kai Fletcher Johnston |
|
| Taiyou Shinyou Gambier Bay Zuihou Kai Ni B |
Have both:
|
| Taiyou Kai/Kai Ni Shinyou Kai Kai Ni |
|
| Hyuuga Kai Ni |
Either:
|
Minimum OASW Level
The minimum level for OASW can be calculated using:
[math]\displaystyle{ \text{Level}_\text{min} = \bigl\lceil \left( \left(\text{OASW}-\text{ASW}_\text{equip} \right) - \text{OASW}_\text{min} \right) \times \frac{99}{\text{OASW}_\text{max}-\text{OASW}_\text{min}} \bigr\rceil }[/math]
- [math]\displaystyle{ \text{OASW}_\text{min} }[/math] is the minimum ASW of the ship as noted in the tables below.
- [math]\displaystyle{ \text{OASW}_\text{max} }[/math] is the maximum ASW of the ship as noted in the tables below.
- [math]\displaystyle{ \text{ASW}_\text{equip} }[/math] is the total base ASW provided by equipment.
- [math]\displaystyle{ \text{OASW} }[/math] is the relevant OASW threshold.
- [math]\displaystyle{ 60 }[/math] for DEs with sonars.
- [math]\displaystyle{ 75 }[/math] for DEs without sonars and ASW equipment that have 4≤ ASW.
- [math]\displaystyle{ 65 }[/math] for CVLs with 7≤ ASW planes OR Taiyou/Shinyou Kai/Kai Ni
- [math]\displaystyle{ 100 }[/math] for all other ships.
Minimum OASW Chart
The following apply to the tables below:
- Only easily obtainable equipment combinations are shown.
- The equipment abbreviations are:
- T4S: Type 4 SONAR
- T3S: Type 3 SONAR
- T3DCP: Type 3 Depth Charge Launcher
- T2DC: Type 2 Depth Charge
- 931: Type 97 Torpedo Bomber (931 Air Group)
- Ships with default ASW as detailed in the section above aren't listed.
- Numbers in brackets are the total ASW of the equipment setup.
- Only the top remodel is applicable unless otherwise stated.
- If you require minimum OASW levels for remodels or equipment combinations that aren't listed, you can use the formula above and minimum and maximum ASW stats on the ship girl pages.
OASW Tables
All ships are presumed to be of the highest possible remodel unless otherwise stated
- ↑ Only values for base remodels are calculated because all DEs are capable of 1-slot OASW on .
- ↑ Only values for base remodels are calculated for Taiyou and Shinyou because they are capable of 1-slot OASW on and K2.
See Also
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