Table Explainer
When equiping '"Large Caliber Main Guns" on a FBB/BB/BBV, the resulting accuracy bonus/penalty is:
| ExpandFit Formula
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[math]\displaystyle{ \text{ACC}_\text{bonus} = \sum^{\text{All Groups}} C_{Group} \times \sqrt{N_{Group}} \times M }[/math]
- With
- [math]\displaystyle{ \text{All Groups} }[/math] the gun groups and sub-groups defined in the following tables.
- [math]\displaystyle{ C_{Group} }[/math] the accuracy modifier of the group, given in the following table.
- When a ship has additional bonuses to a group compared to her type, this bonus is summed as a separate "Group"
- [math]\displaystyle{ N_{Group} }[/math] the number of guns of a same group.
- [math]\displaystyle{ M }[/math] the Marriage bonus of 0.6 when applicable, 1 else.
- This bonus is applied in all cases, so penalties are reduced by 0.6, as well as bonuses.
- For Iowa-class with the USN 16" Mk7 guns, M may be better, the observed bonu being [math]\displaystyle{ \text{ACC}_\text{bonus} = 6 \times \sqrt{N_{16inch Mk.7}} + 12 \times \sqrt{N_{16inch Mk.7 GFCS}} }[/math].
For BB only: if the base maximum HP  (unmodified & before marriage) is superior to 92, set fit bonuses are set to 0.
Do note that speed modding ships (to Fast+) has been observed to worsen the penalties on certain ships.
- Examples
Kongou Kai Ni equipped with 2 IJN 35.6cm Twin K2 :
- [math]\displaystyle{ \text{ACC}_\text{bonus} = C_{35.6 cm FBB} \times \sqrt{N_{35.6 cm}} + C_{35.6 cm Kongou-class} \times \sqrt{N_{35.6 cm}} = ( 4 + 3 ) \times \sqrt{2} = +9.90 }[/math]
- This bonus stays the same when married, as no M multiplier is applied in this case.
Nagato Kai Ni equiped with 1 IJN 41cm Twin and 1 IJN 51cm Twin Proto :
- [math]\displaystyle{ \text{ACC}_\text{bonus} = C_{41 cm BB} \times \sqrt{N_{41 cm}} + C_{IJN 41cm Twin Nagato Kai Ni} \times \sqrt{N_{IJN 41cm Twin}} + C_{51cm} \times \sqrt{N_{51cm}} = ( 2 + 4 - 5 ) \times \sqrt{1} = +1.00 }[/math]
- If Nagato Kai Ni is married, the M multiplier is applied to the -5 only in this case.
Musashi Kai Ni equiped with 1 IJN 51cm Twin and 1 IJN 51cm Triple Proto
- [math]\displaystyle{ \text{ACC}_\text{bonus} = C_{51 cm Musashi Kai Ni} \times \sqrt{N_{51 cm}} + = 0 \times \sqrt{2} = +0.00 }[/math]
- Musashi Kai Ni has 99 bases , and so has bonuses set to ZERO for those guns.
Yamato Kai Ni Juu equiped with 1 IJN 46cm Triple and 1 IJN 51cm Triple Proto
- [math]\displaystyle{ \text{ACC}_\text{bonus} = C_{46 cm Triple Yamato-class} \times \sqrt{N_{46 cm Triple}} + C_{46/51 cm Yamato Kai Ni Juu} \times \sqrt{N_{46/51 cm}} = 7 \times \sqrt{1} + (-8) \times \sqrt{2} = -4.31 }[/math]
- If Yamato Kai Ni Juu is married, the M multiplier is applied to both parts of the equation in this case.
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