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Artillery Spotting, commonly referred to as ArtySpot, Daytime CI, or simply Spotting, is a series of special attacks that allow ships with specific equipment setups to perform Cut-in attacks during the Day Battle. These attacks grant post-cap damage bonuses as well as increased shelling accuracy.

The Carrier-equivalent for Artillery Spotting is Aircraft Carrier Cut-in (CVCI). Mechanically, they share the same core mechanics, but have different trigger conditions.

Artillery Spotting

Artillery Spotting is a feature for ships that can launch Seaplanes. Using special equipment setups, those ships may perform one of multiple special attacks. These attacks are often referred to as Cut-ins due to the way the equipment is displayed in the screen before the attacks are performed. Particular Cut-ins are often referred to by their acronym, such as APCI for Main AP Shell Cut-in, Sec CI for Secondary Gun Cut-in, etc.

Cut-ins may be activated during a ship's turn and will override its normal shelling attack. Do note that the specific equipment being shown during the Cut-ins have no influence on the damage output.

Trigger Conditions

The fleet attains Air Supremacy. Artillery Spotting and Aircraft Carrier Cut-ins can now be performed

• The fleet must have attained Air Superiority (AS) or Air Supremacy (AS+) Air State.
  • For details on Air State, please refer to Aerial Combat - Stage 1
• The ship must be equipped with at least one ReconSeaplane Recon or BomberSeaplane Bomber on a slot with size higher than 0.
  • Seaplane Fighters or Carrier Recons do not enable Artillery Spotting.
  • Main Suisei Cut-in specifically ignores this condition.
• The ship must be equipped with at least one Main Main Gun.
• The ship must target another ship and attack it with Surface Shelling.
  • ASW shelling has no Artillery Spotting setups.
• The ship must not be Heavily damaged (大破)

Setups and Attack Types

Musashi performing Main AP Shell Cut-in (APCI)

Different setups have different conditions, trigger rates, damage, and number of hits. Cut-ins are determined by the attack's prerequisites as well as the previously stated trigger conditions.

For a given Cut-in, any other equipment can be added on the remaining slots. Be wary that adding certain equipment may change the Cut-in that will be rolled. Meeting prerequisites for multiple Cut-ins grants each a chance to be activated: in this case, the Cut-ins will be rolled in order of priority from top to bottom.

For clarity purposes:

• is used to indicate a Main Gun of any size,
• is used to indicate a "Seaplane" (Recon or Bomber),
• is used to indicate a Secondary Gun of any size,
• is used to indicate an AP Shell,
• is used to indicate a Radar of any type,
• is used to indicate any "634 Air Group" Suiseis
  
  .
• is a custom icon used to indicate any Zuiun variant:

Zuiuns
Zuiun Zuiun (631 Air Group) Zuiun (634 Air Group) AAR Zuiun Model 12 AAR Zuiun Model 12 (634 Air Group) AAR Zuiun (634 Air Group/Skilled) AAR Zuiun Kai 2 (634 Air Group) AAR Zuiun Kai 2 (634 Air Group/Skilled) AAR Prototype Night Zuiun (Attack Equipment) AAR

Attack Type	Prerequisites	Post-cap Damage Modifier	Accuracy Modifier	Hits	Notes	Trigger Rate [math]\displaystyle{ \text{Base}_\text{attack} }[/math] (lower is better)	% per Base Value
Main Zuiun Cut-in (Zuiun CI)		1.35	?	1	Ise-class Kai Ni only	120	0.83%
Main Suisei Cut-in (Suisei CI)		1.3	?	1		130	0.77%
Main AP Shell Cut-in (APCI)		1.5	1.2	1		150	0.66%
Secondary AP Shell Cut-in (Sec APCI)		1.3	1.3	1		140	0.71%
Secondary Radar Cut-in (Radar CI)		1.2	1.5	1		130	0.77%
Secondary Cut-in (Sec CI)		1.1	1.3	1		120	0.83%
Double Attack (DA)		1.2	1.1	2		130	0.77%

• If all rolls fail or the ship meets no Cut-in requirements, then it'll perform a Single Attack: a default 1 hit, no damage modifier shelling attack.
• If an Artillery Spotting attack is evaded, it will deal chip damage instead.
• If valid set-ups for both Suisei-CI and Zuiun-CI are used, only the Zuiun-CI may trigger.

Aircraft Carrier Cut-In

Aircraft Carrier Cut-in, or CVCI for short, is a feature for ships that can launch Carrier-based planes. Similar to Artillery Spotting, using special equipment setups, those ships may perform one of multiple special attacks.

CVCI may be activated during a ship's turn and will override its normal shelling attack.

Trigger Conditions

• The fleet must have attained Air Superiority (AS) or Air Supremacy (AS+) Air State.
  • For details on Air State, please refer to Aerial Combat - Stage 1
• The carrier must fulfill one of the equipment setups.
• The carrier must be shelling a surface ship.
  • Installations cannot be attacked by CVCI.

Setups and Attack Types

Zuihou performing Fighter-Bomber-Attacker Cut-in (FBA)

Different setups have different conditions, trigger rates, damage, and number of hits. Cut-ins are determined by the attack's prerequisites as well as the previous state trigger conditions.

For a given Cut-in, any other equipment can be added to the remaining slots. Be wary that adding certain equipment may change the Cut-in that will be rolled. Meeting prerequisites for multiple Cut-ins grants each a chance to be activated: in this case, the Cut-ins will be rolled in order of priority from top to bottom.

• is used to indicate a Torpedo Bomber. In the game, is referred to as Attacker.
• is used to indicate a Dive Bomber. In the game, is referred to as Bomber.
• is used to indicate a Fighter.

Attack Type	Prerequisites	Post-cap Damage Modifier	Accuracy Modifier	Hits	Trigger Rate [math]\displaystyle{ \text{Base}_\text{attack} }[/math] (lower is better)	% per Base Value
Fighter-Bomber-Attacker (FBA)		1.25	1.2~1.3?	1	125	0.86%
Bomber-Bomber-Attacker (BBA)		1.2	1.2~1.3?	1	135	0.80%
Bomber-Attacker (BA)		1.15	1.2~1.3?	1	150	0.66%

• If all rolls fail or the ship meets no Cut-in requirements, then it'll perform a Single Attack: a default 1 hit, no damage modifier shelling attack.
• If a CVCI attack is evaded, it will deal chip damage instead.

Note: The Critical Damage modifier granted by Aircraft Proficiency works differently when performing a CVCI.

Trigger Rates

Artillery Spotting and Aircraft Carrier Cut-Ins share the same trigger rate formula. The chance of successfully rolling and triggering a cut-in is mainly affected by the Air State and the "raw LoS", as well as some other factors like the type of CI, the ship's luck, and the Recons/Bombers currently in the fleet.

Trigger rate formula

[math]\displaystyle{ \text{Trigger %}_\text{Cut-in} = \dfrac{10 + \text{Base}_\text{ship} }{\text{Base}_\text{attack} } \times 100 }[/math] With [math]\displaystyle{ \text{Base}_\text{ship} = \left \lfloor \lfloor \sqrt{\text{Luck}} \rfloor + \text{Mod}_\text{Flag} + \text{Mod}_\text{AS1} + \left \lfloor \text{LoS}_\text{Fleet} + \text{Mod}_\text{AS2} \times \text{LoS}_\text{Ship} \right \rfloor \times \text{Mod}_\text{AS3}\right \rfloor }[/math] [math]\displaystyle{ \text{Base}_\text{attack} }[/math] the Value used by each type of Cut-in. See the above tables for value. [math]\displaystyle{ \text{Mod}_\text{Flag} }[/math] being 15 if the ship is the flagship, 0 otherwise, [math]\displaystyle{ \text{Mod}_\text{ASx} }[/math] the Air State modifiers: Mod AS AS+ [math]\displaystyle{ \text{Mod}_\text{AS1} }[/math] 0 10 [math]\displaystyle{ \text{Mod}_\text{AS2} }[/math] 1.2 1.6 [math]\displaystyle{ \text{Mod}_\text{AS3} }[/math] 0.6 0.7 [math]\displaystyle{ \text{LoS}_\text{Ship} = \sum^{\text{Attacking Ship}}\text{LoS}_\text{Equip} }[/math] [math]\displaystyle{ \text{LoS}_\text{Fleet} = \left \lfloor \sqrt{\text{LoS}_\text{total} } + \frac{\text{LoS}_\text{total}}{10} \right \rfloor }[/math] [math]\displaystyle{ \text{LoS}_\text{total} = \sum^{\text{All ships}}\text{LoS}_\text{Base} + \sum^{\text{All Recons/Bombers}}\text{LoS}_\text{Equip} \times \lfloor\sqrt{\text{Plane}_\text{Count}}\rfloor }[/math] [math]\displaystyle{ \text{LoS}_\text{Base} }[/math] being the ship's base LoS value without any equipment, [math]\displaystyle{ \text{LoS}_\text{Equip} }[/math] being the displayed base LoS value of equipment (excluding Visible Bonuses), [math]\displaystyle{ \text{Plane}_\text{Count} }[/math] being the current count of each individual plane slot.