Ocean Area Survey Quests
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Ocean Area Survey Quests (海域調査), also referred to as "lettered quests," are one-time completion quests that ultimately unlock the True Ocean Area Quests. These quests do not have farmable drops, but each world has 3 rewards when obtaining 10/20/30 stars.
See List of Enemies for details on enemy types and enemy colored buffs.
General strategies for clearing:
Enemies do not have to be sunk in order.
Prioritize enemies that will eventually move out of range, or use carriers.
Ships that can inflict the Inhibit status can stop healing enemies from healing.
Ocean Area Survey Star Rewards | |||
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10 Stars | 20 Stars | 30 Stars | |
World 1 | Oath Parts C x35 SR 15.2cm Triple-barreled Gun (CL) x1 |
Upgrade Parts x10 SR 53.3cm Quadruple Torpedo x1 |
Upgrade Parts x5 Oath Parts C x50 SSR 12.7 Single-barreled Side Gun x1 |
World 2 | Rank C Offense Textbook x20 Rank C Defense Textbook x20 SR 20.3 SK C/34 Gun (CA) x1 |
Rank B Offense Textbook x20 SR 53.3cm Quadruple Torpedo x1 |
Rank B Offense Textbook x30 SSR Oerlikon 20mm Anti-air Cannon x1 |
World 3 | Oath Parts B x35 Blue Chip x2 |
Rank B Defense Textbook x20 Blue Chip x3 |
Rank B Defense Textbook x30 Blue Chip x5 |
World 4 | Oath Parts B x35 Blue Chip x2 |
Rank B Offense Textbook x20 Rank B Defense Textbook x20 Blue Chip x3 |
Upgrade Parts x15 Blue Chip x5 |
World 5 | Rank A Defense Textbook x20 Blue Chip x2 |
Rank A Offense Textbook x20 Blue Chip x3 |
Oath Parts A x20 Blue Chip x5 |
World 6 | Rank A Defense Textbook x30 Blue Chip x2 |
Rank A Offense Textbook x30 Blue Chip x3 |
Oath Parts A x30 Blue Chip x5 |
World 7 | Rank A Defense Textbook x40 Blue Chip x2 |
Rank A Offense Textbook x40 Blue Chip x3 |
Oath Parts A x40 Blue Chip x5 |
Maps and Enemy Layouts[edit | hide all | hide | edit source]
World 7 - Bottomless Abyss | ||||||||
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World mechanic: Moving, appearing, disappearing, and speed-altering paths | ||||||||
Map | Enemy layout | Enemy composition | ||||||
7A | Day Battle: 90s Fixed course: Ships take 7% of their health as damage every second when not on the designated course. Ferocious range: Ships attacking from medium range and closer do 20% additional damage. |
Mover Destroyer Mover Destroyer Mover Destroyer Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser | ||||||
Mover Light Cruiser Mover Light Cruiser Mover Battleship Mover Battleship | ||||||||
Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser Mover Destroyer | ||||||||
7B | Day Battle: 90s Fixed course: Ships take 7% of their health as damage every second when not on the designated course. Ferocious range: Ships attacking from medium range and closer do 20% additional damage. |
Mover Destroyer Mover Destroyer Mover Destroyer Mover Heavy Cruiser Mover Heavy Cruiser | ||||||
Mover Light Cruiser Mover Light Cruiser Mover Battleship | ||||||||
Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser | ||||||||
Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser | ||||||||
7C | Day Battle: 90s Fixed course: Ships take 7% of their health as damage every second when not on the designated course. Ferocious range: Ships attacking from medium range and closer do 20% additional damage. |
Mover Battleship Mover Destroyer Mover Destroyer Mover Heavy Cruiser Mover Heavy Cruiser | ||||||
Mover Light Cruiser Mover Light Cruiser Mover Battleship | ||||||||
Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser | ||||||||
Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser | ||||||||
7D | Day Battle: 100s Fixed course: Ships take 7% of their health as damage every second when not on the designated course. Foresight: Destroying ships reveals more of the designated course. Ferocious range: Ships attacking from medium range and closer do 20% additional damage. |
Mover Destroyer Mover Destroyer Mover Destroyer Mover Heavy Cruiser Mover Heavy Cruiser | ||||||
Mover Heavy Cruiser | ||||||||
Mover Heavy Cruiser | ||||||||
Mover Light Cruiser | ||||||||
Mover Heavy Cruiser | ||||||||
Mover Light Cruiser | ||||||||
7E | Day Battle: 90s Fixed course: Ships take 7% of their health as damage every second when not on the designated course. Ferocious range: Ships attacking from medium range and closer do 20% additional damage. |
Mover Destroyer Mover Destroyer Mover Destroyer Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser | ||||||
Mover Light Cruiser Mover Light Cruiser Mover Battleship Mover Battleship | ||||||||
Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser Mover Destroyer | ||||||||
7F | Day Battle: 90s Fixed course: Ships take 7% of their health as damage every second when not on the designated course. Trap: Destroying certain enemies will spawn a circle that tracks your fleet, doing continuous damage. Ferocious range: Ships attacking from medium range and closer do 20% additional damage. |
Mover Destroyer Mover Destroyer Mover Heavy Cruiser Mover Heavy Cruiser | ||||||
Mover Battleship Mover Battleship Mover Heavy Cruiser | ||||||||
Mover Heavy Cruiser Mover Heavy Cruiser | ||||||||
Mover Destroyer Mover Destroyer | ||||||||
7G | Day Battle: 120s Fixed course: Ships take 7% of their health as damage every second when not on the designated course. Ferocious range: Ships attacking from medium range and closer do 20% additional damage. |
Mover Destroyer Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser This fleet launches magnet salvos. | ||||||
Mover Heavy Cruiser Mover Heavy Cruiser Mover Light Cruiser | ||||||||
Mover Light Cruiser Mover Battleship Mover Battleship | ||||||||
Mover Heavy Cruiser Mover Heavy Cruiser | ||||||||
Mover Heavy Cruiser Mover Destroyer | ||||||||
Mover Destroyer Mover Destroyer | ||||||||
7H | Day Battle: 90s Fixed course: Ships take 7% of their health as damage every second when not on the designated course. Ferocious range: Ships attacking from medium range and closer do 20% additional damage. |
Mover Destroyer Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser | ||||||
Mover Heavy Cruiser Mover Light Cruiser Mover Light Cruiser | ||||||||
Mover Battleship Mover Battleship Mover Heavy Cruiser | ||||||||
Mover Heavy Cruiser Mover Heavy Cruiser | ||||||||
Mover Destroyer Mover Destroyer Mover Destroyer | ||||||||
7I | Day Battle: 120s Fixed course: Ships take 7% of their health as damage every second when not on the designated course. Formless Armor: Unknown H has 100% damage reduction, which decreases by 20% for every fleet sunk. Ferocious range: Ships attacking from medium range and closer do 20% additional damage. |
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Mover Heavy Cruiser Mover Light Cruiser Mover Light Cruiser | ||||||||
Mover Battleship Mover Battleship Mover Heavy Cruiser | ||||||||
Mover Heavy Cruiser Mover Heavy Cruiser | ||||||||
Mover Destroyer Mover Destroyer Mover Destroyer | ||||||||
Mover Destroyer Mover Heavy Cruiser Mover Heavy Cruiser | ||||||||
7J | Day Battle: 150s Fixed course: Ships take 7% of their health as damage every second when not on the designated course. Trap: Destroying certain enemies will spawn a circle that tracks your fleet, doing continuous damage. Ferocious range: Ships attacking from medium range and closer do 20% additional damage. |
|||||||
Mover Heavy Cruiser Mover Heavy Cruiser | ||||||||
Mover Destroyer Mover Destroyer | ||||||||
Mover Destroyer Mover Heavy Cruiser | ||||||||
Mover Heavy Cruiser Mover Light Cruiser | ||||||||
World 4 - The Storm | ||
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Map | Enemy layout | Enemy composition |
4A | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. Mental fatigue: Affected by the storm, allies gain more fatigue at higher speeds. |
Mover Heavy Cruiser Mover Heavy Cruiser Mover Destroyer Mover Destroyer Mover Destroyer Mover Heavy Cruiser |
Mover Destroyer Mover Destroyer Mover Destroyer Mover Heavy Cruiser | ||
Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser | ||
4B | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. Mental fatigue: Affected by the storm, allies gain more fatigue at higher speeds. |
Mover Battleship |
Mover Heavy Cruiser Mover Heavy Cruiser Mover Battleship Mover Battleship Mover Heavy Cruiser | ||
Mover Heavy Cruiser Mover Battleship Mover Battleship | ||
4C | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. Mental fatigue: Affected by the storm, allies gain more fatigue at higher speeds. |
Mover Battleship Mover Battleship |
Mover Battleship | ||
Mover Destroyer | ||
4D | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. Mental fatigue: Affected by the storm, allies gain more fatigue at higher speeds. |
Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser |
Mover Battleship Mover Battleship | ||
4E | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. Mental fatigue: Affected by the storm, allies gain more fatigue at higher speeds. |
Mover Heavy Cruiser Mover Heavy Cruiser Mover Destroyer Mover Destroyer Mover Destroyer Mover Heavy Cruiser |
Mover Destroyer Mover Destroyer Mover Destroyer Mover Heavy Cruiser | ||
Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser | ||
4F | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. |
Mover Heavy Cruiser Mover Heavy Cruiser Mover Destroyer |
Mover Destroyer Mover Destroyer Mover Destroyer Mover Heavy Cruiser Mover Heavy Cruiser | ||
Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser Mover Heavy Cruiser | ||
4G | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. Mental fatigue: Affected by the storm, allies gain more fatigue at higher speeds. |
Mover Battleship Mover Battleship Mover Battleship Mover Battleship Mover Heavy Cruiser Mover Heavy Cruiser |
Mover Battleship Mover Battleship | ||
Mover Battleship Mover Battleship Mover Battleship Mover Battleship Mover Heavy Cruiser Mover Heavy Cruiser | ||
Mover Battleship Mover Battleship | ||
4H | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. Mental fatigue: Affected by the storm, allies gain more fatigue at higher speeds. |
Mover Destroyer |
Mover Light Cruiser | ||
4I | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. Mental fatigue: Affected by the storm, allies gain more fatigue at higher speeds. |
Mover Battleship File:Enemy UI CL Green.png Mover Destroyer |
Mover Battleship Mover Light Cruiser | ||
4J | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. Mental fatigue: Affected by the storm, allies gain more fatigue at higher speeds. |
Mover Battleship Mover Destroyer |
Mover Light Cruiser Mover Destroyer | ||
Mover Battleship File:Enemy UI CL Green.png File:Enemy UI CL Green.png |
World 2 - Unsailed Seas | ||
---|---|---|
Map | Enemy layout | Enemy composition |
2A | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. |
Mover Light Cruiser Mover Light Cruiser Mover Light Cruiser |
Mover Light Cruiser | ||
Mover Battleship | ||
2B | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. |
Mover Battleship |
Mover Battleship | ||
Mover Battleship | ||
2C | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. |
Mover Light Cruiser Mover Light Cruiser Mover Light Cruiser |
Mover Battleship | ||
Mover Battleship | ||
2D | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. |
Mover Battleship Mover Battleship |
Mover Light Cruiser | ||
Mover Battleship | ||
2E | Day Battle: 60s + Night Battle: 20s Not enough vigor: In battle, enemies regenerate 2% of their health every 2 seconds. Greatly increases the duration of Inhibit when affected by this status effect. |
Mover Battleship File:Enemy UI CL Green.png File:Enemy UI CL Green.png |
2F | Day Battle: 60s + Night Battle: 20s Not enough vigor: In battle, enemies regenerate 2% of their health every 2 seconds. Greatly increases the duration of Inhibit when affected by this status effect. |
Mover Battleship File:Enemy UI CL Green.png File:Enemy UI CL Green.png File:Enemy UI CL Green.png |
2G | Day Battle: 60s + Night Battle: 20s Not enough vigor: In battle, enemies regenerate 2% of their health every 2 seconds. Greatly increases the duration of Inhibit when affected by this status effect. |
Mover Battleship Mover Battleship Mover Battleship File:Enemy UI CL Green.png File:Enemy UI CL Green.png File:Enemy UI CL Green.png |
2H | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. |
|
Mover Light Cruiser Mover Light Cruiser | ||
2I | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. Enemy fleet 1 (CV) is placed outside long range. |
Mover Light Cruiser |
Mover Aircraft Carrier | ||
Mover Destroyer | ||
2J | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. |
Mover Light Cruiser |
Mover Light Cruiser | ||
Mover Light Cruiser | ||
Mover Light Cruiser | ||
Mover Light Cruiser | ||
Mover Light Cruiser |
World 1 - Wasteland | ||
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Map | Enemy layout | Enemy composition |
1A | Day Battle: 60s Opening air support: An airstrike occurs at the start of battle. |
Mover Aircraft Carrier |
1B | Day Battle: 60s Opening air support: An airstrike occurs at the start of battle. |
Mover Battleship |
1C | Day Battle: 60s Opening air support: An airstrike occurs at the start of battle. |
Mover Light Cruiser |
1D | Day Battle: 60s |
Mover Light Cruiser Mover Heavy Cruiser |
1E | Night Battle: 80s |
Mover Heavy Cruiser |
Mover Light Cruiser | ||
1F | Night Battle: 80s |
Mover Battleship |
Mover Heavy Cruiser Mover Heavy Cruiser | ||
1G | Night Battle: 80s |
Mover Heavy Cruiser Mover Heavy Cruiser |
Mover Battleship | ||
Mover Battleship | ||
1H | Day Battle: 60s Torpedoes in the water: Sailing direction is locked. |
Mover Aircraft Carrier Mover Battleship Mover Battleship Mover Destroyer |
1I | Day Battle: 60s Torpedoes in the water: Sailing direction is locked. |
Mover Destroyer Mover Destroyer Mover Destroyer Mover Destroyer Mover Destroyer Mover Destroyer |
1J | Day Battle: 60s + Night Battle: 20s Torpedoes in the water: Sailing direction is locked. |
Mover Battleship Mover Heavy Cruiser Mover Heavy Cruiser |
Mover Heavy Cruiser Mover Light Cruiser Mover Light Cruiser | ||
Mover Light Cruiser Mover Light Cruiser Mover Light Cruiser |