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The opening anti-submarine attack (OASW) can be performed by a ship that meets the minimum required visible ASW stat and necessary equipment requirements.

OASW Ship ASW Stat Required Equipment Required
Any Destroyer/Light Cruiser 100+ ASW Sonar 1 Sonar Equipped
Any Coastal Defense Ship 60+ ASW
-or-
w/o Sonar: 75+ ASW
Sonar 1 Sonar Equipped
-or-
DepthCharge w/o Sonar: Any Equip with 4+ ASW
Isuzu Kai Ni Banner
Tatsuta Kai Ni Banner
Jervis Kai Banner
Janus Kai Banner
Fletcher Banner
Johnston Banner

Samuel B. Roberts Kai Banner

Can OASW innately N/A
Taiyou Banner
Shinyou Banner
Gambier Bay Banner
Zuihou Kai Ni B Banner
65+ ASW RedPlane BluePlane Subplane Heli
Taiyou/Shinyou: Any Plane with 1+ ASW
Rest: Any Plane with 7+ ASW
Hyuuga Kai Ni Banner N/A HeliHeli2 AutogryosKa Type Observation Autogyro 069 CardO Type Observation Autogyro Kai 324 CardO Type Observation Autogyro Kai Ni 325 Card
-or-
Heli1 HelicopterS-51J 326 CardS-51J Kai 327 Card.
  • For TaiyouTaiyou Banner and ShinyouShinyou Banner Kai and Kai ni the bombers are not required, 65 displayed ASW is sufficient (however, if she is not using a torpedo or dive bomber with ASW stat, she will be able to perform OASW attack but will be unable to perform ASW attacks in the shelling phase). OASW attacks will be performed even if she is at medium damage or all her planes were shot down.
  • If several ships fulfill the requirements, then they all can perform preemptive attacks, each attacking a random submarine in the enemy fleet. The firing order is determined by the range order, similar to the First Shelling Phase. The order for ships of the same range is random.
  • The damage follows the usual ASW formula and is affected by the usual modifiers (formation, engagement, health, ammo), as well as equipment improvements.

OASW Level TableEdit

The following tables show how much base ASW is needed (in form of required ship level) to enable OASW with a given equipment setup (T4: Type 4 Passive Sonar, T3: Type 3 Active Sonar, DC: Type 3 Depth Charge Projector ASWR: Prototype 15cm 9-tube ASW Rocket Launcher).

DD
Ship 3 Slots 2 Slots 1 Slot
T4/T4/ASWR
39 + 61
T4/T4/T4
36 + 64
T4/T4/T3
34 + 66
T4/T4/DC
32 + 68
T4/T3/DC
30 + 70
T3/T3/DC
28 + 72
T4/T4
24 + 76
T4/T3
22 + 78
T4/DC
20 + 80
T3/DC
18 + 82
T4
12 + 88
T3
10 + 90
Asashio K2DAsashio Kai Ni D Banner 85 97 102
Umikaze K2Umikaze Kai Ni Banner 82 88 92 96 99 110 114
Libeccio KaiLibeccio Kai Banner
Maestrale KaiMaestrale Kai Banner
52 60 65 70 75 80 90 95 99 104 119 124
Satsuki K2Satsuki Kai Ni Banner 75 78 82 90 94 98 101 113 117
Fumizuki K2Fumizuki Kai Ni Banner 77 78 82 90 94 98 101 113 117
Asashimo KaiAsashimo Kai Banner 59 66 70 75 79 84 93 97 102 106 120 124
Grecale KaiGrecale Kai Banner 56 63 68 73 78 83 92 97 102 107 121 126
Shigure K2Shigure Kai Ni Banner 66 74 78 82 87 91 99 104 108 112 125 130
Ushio K2Ushio Kai Ni Banner 67 74 79 83 88 93 102 106 111 116 129 134
ВерныйVerniy Banner 70 77 81 86 90 95 104 108 113 117 131 135
Akizuki KaiAkizuki Kai Banner
Teruzuki KaiTeruzuki Kai Banner
Hatsuzuki KaiHatsuzuki Kai Banner
74 81 85 90 95 99 109 114 118 123 137 142
Harukaze KaiHarukaze Kai Banner 78 84 88 92 96 99 107 111 115 119 131 135
Matsukaze KaiMatsukaze Kai Banner 82 88 92 96 99 103 111 115 119 123 135 139
Kamikaze KaiKamikaze Kai Banner 80 87 91 95 99 104 112 117 121 125 138 143
Yuudachi K2Yuudachi Kai Ni Banner
Murakumo K2Murakumo Kai Ni Banner
Hatsushimo K2Hatsushimo Kai Ni Banner
Mutsuki K2Mutsuki Kai Ni Banner
80 87 92 97 102 107 116 121 126 131 145 150
Hatsuharu K2Hatsuharu Kai Ni Banner 79 87 92 97 102 107 117 122 127 132 148 153
Kisaragi K2Kisaragi Kai Ni Banner 81 88 92 97 102 107 116 121 125 130 144 149
Fubuki K2Fubuki Kai Ni Banner 83 90 95 99 104 109 118 123 128 132 147 151
Kasumi K2/K2BKasumi Kai Ni Banner
Kasumi Kai Ni B Banner
82 90 95 99 104 109 119 124 129 134 149 154
Asakaze KaiAsakaze Kai Banner 86 92 96 99 103 107 115 119 123 127 139 143
Akatsuki K2Akatsuki Kai Ni Banner 86 94 99 105 110 115 126 131 136 141 157 162
Ooshio K2Ooshio Kai Ni Banner 92 99 105 110 115 120 131 136 141 146 162 N/A
Ayanami K2Ayanami Kai Ni Banner
Kawakaze K2Kawakaze Kai Ni Banner
94 102 107 113 118 123 133 139 144 149 165 N/A
Arashio K2Arashio Kai Ni Banner 105 114 120 126 132 138 150 156 162 N/A N/A N/A
Shimakaze KaiShimakaze Kai Banner
Yukikaze KaiYukikaze Kai Banner
106 115 121 127 134 140 152 158 164 N/A N/A N/A


CL/CLT
Ship 3 Slots 2 Slots 1 Slot
T4/T4/ASWR
39 + 61
T4/T4/T4
36 + 64
T4/T4/T3
34 + 66
T4/T4/DC
32 + 68
T4/T3/DC
30 + 70
T3/T3/DC
28 + 72
T4/T4
24 + 76
T4/T3
22 + 78
T4/DC
20 + 80
T3/DC
18 + 82
T4
12 + 88
T3
10 + 90
Naka K2Naka Kai Ni Banner 48 49 54 59 65 75 81 86 91 108 113
Kinu Kai/Kai NiKinu Kai Banner
Kinu Kai Ni Banner
42 52 58 64 71 75 80 86 91 108 113
Yura Kai/Kai NiYura Kai Banner
Yura Kai Ni Banner
42 52 58 64 71 77 79 85 91 97 114 120
Tama Kai NiTama Kai Ni Banner 70 72 84 87 92 97 112 118
Abukuma Kai/Kai NiAbukuma Kai Banner
Abukuma Kai Ni Banner
42 52 58 64 71 75 82 88 94 99 117 123
Sakawa KaiSakawa Kai Banner 57 63 66 70 74 77 85 88 92 96 107 110
Kiso K2Kiso Kai Ni Banner 65 68 72 76 80 88 92 96 99 111 115
Agano KaiAgano Kai Banner
Noshiro KaiNoshiro Kai Banner
Yahagi KaiYahagi Kai Banner
62 68 71 75 78 82 89 92 96 99 110 114
Jintsuu K2Jintsuu Kai Ni Banner 60 65 70 75 80 90 95 99 104 119 124
Kitakami K2Kitakami Kai Ni Banner
Ooi K2Ooi Kai Ni Banner
65 71 75 79 82 86 94 98 101 105 117 120
Kuma KaiKuma Kai Banner
Tama KaiTama Kai Banner
Natori KaiNatori Kai Banner
67 72 76 80 83 87 94 98 101 105 116 119
Sendai K2Sendai Kai Ni Banner 64 72 77 83 88 94 105 110 116 121 138 143
Tenryuu Kai NiTenryuu Kai Ni Banner 84 87 91 95 99 105 113 118 122 126 139 144


4 Slots CL/CT/DD
Ship 4 Slots
T4/T4/T4/ASWR
51 + 49
T4/T4/T4/T4
48 + 52
T4/T4/T4/T3
46 + 54
T4/T4/T4/DC
44 + 56
T4/T4/T3/DC
42 + 58
T4/T3/T3/DC
40 + 60
T3/T3/T3/DC
38 + 62
Tashkent KaiTashkent Kai Banner 50 54 60 66
Yuubari KaiYuubari Kai Banner
Kashima KaiKashima Kai Banner
55 62 66 71 75 80 84
Katori KaiKatori Kai Banner 67 75 80 85 90 95 99
Giuseppe Garibaldi KaiGiuseppe Garibaldi Kai Banner 68 77 83 88 94 99 105
Duca degli Abruzzi KaiDuca degli Abruzzi Kai Banner 70 79 85 91 97 102 108
Gotland KaiGotland Kai Banner 55 58 66 75 83 91 99
Ooyodo KaiOoyodo Kai Banner 125 132 138 143 148 153 158
Ship 3 Slots
T4/T4/ASWR
39 + 61
T4/T4/T4
36 + 64
T4/T4/T3
34 + 66
T4/T4/DC
32 + 68
T4/T3/DC
30 + 70
T3/T3/DC
28 + 72
Tashkent KaiTashkent Kai Banner 63 72 78 84 90 96
Yuubari KaiYuubari Kai Banner
Kashima KaiKashima Kai Banner
82 88 93 97 102 106
Katori KaiKatori Kai Banner 97 104 109 114 119 124
Giuseppe Garibaldi KaiGiuseppe Garibaldi Kai Banner 102 111 116 122 128 133
Duca degli Abruzzi KaiDuca degli Abruzzi Kai Banner 105 114 120 126 132 137
Gotland KaiGotland Kai Banner 95 108 116 124 132 141
Ooyodo KaiOoyodo Kai Banner 155 163 N/A N/A N/A N/A
Ship 2 Slots 1 Slot
T4/ASWR
27 + 73
T4/T4
24 + 76
T4/T3
22 + 78
T4/DC
20 + 80
T3/DC
18 + 82
T4
12 + 88
T3
10 + 90
Tashkent KaiTashkent Kai Banner 99 108 114 120 126 144 150
Yuubari KaiYuubari Kai Banner
Kashima KaiKashima Kai Banner
108 115 119 124 129 141 146
Katori KaiKatori Kai Banner 127 134 139 144 149 164 N/A
Giuseppe Garibaldi KaiGiuseppe Garibaldi Kai Banner 136 145 150 156 162 N/A N/A
Duca degli Abruzzi KaiDuca degli Abruzzi Kai Banner 140 149 155 161 166 N/A N/A
Gotland KaiGotland Kai Banner 145 157 165 174 N/A N/A N/A
Ooyodo KaiOoyodo Kai Banner N/A N/A N/A N/A N/A N/A N/A

See AlsoEdit

Enemy Ships with OASW
Destroyer
Light Cruiser
Light Carrier
Seaplane Tender
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