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→How to Use
** As equipment is spent even on failure, you are recommended to use the success slider when improvements consume rare equipment.
** As equipment is spent even on failure, you are recommended to use the success slider when improvements consume rare equipment.
* There is no visible stat difference between improved and unimproved equipment.
* There is no visible stat difference between improved and unimproved equipment.
** Improvements on equipment have been shown to increase firepower, torpedo and ASW stats depending on the category of the equipment.
** Improvements on equipment have been shown to increase firepower, torpedo and ASW damage depending on the category of the equipment. Speculated to be a bonus on [[Combat#Base_Attack_Power|base attack power]].
** Preliminary results as of May 31, 2015 are:
** Japanese sources are currently testing the effect of improvements. Preliminary results as of 2014/12/10 are:
*** 12.7cm Twin Gun Mount, 61cm Quad (Oxygen) Torpedo Mount, Type 94 Depth Charge, etc:
*** 12.7cm Twin Gun Mount and similar (not specified in wikiwiki)
**** ★+1~3: +1 bonus to firepower/torpedo/ASW
**** ★+1~3: +1 bonus to firepower/torpedo
**** ★+4~8: +2 bonus to firepower/torpedo/ASW
**** ★+4~8: +2 bonus to firepower/torpedo
**** ★+9~10: +3 bonus to firepower/torpedo/ASW
**** ★+9~10: +3 bonus to firepower/torpedo
*** 35.6cm Twin Gun Mount, 41cm Twin Gun Mount, etc:
*** 35.6cm Twin Gun Mount:
**** ★+1: +1 bonus to firepower
**** ★+1: +1 bonus to firepower
**** ★+2~4: +2 bonus to firepower
**** ★+2~4: +2 bonus to firepower
**** ★+5~7: +3 bonus to firepower
**** ★+5~7: +3 bonus to firepower
**** ★+8~10: +4 bonus to firepower
**** ★+8~10: +4 bonus to firepower
*** Depth charges and sonars are reported to boost firepower and ASW.
*** Depth charges, sonars, fire directors, and searchlights increase shelling damage ([[Type 91 Anti-Aircraft Fire Director|Type 91 FD]] ★+10 shown to increase effective firepower by 3). Torpedoes and autocannons do not.
:::*The damage increase is speculated to be the same formula as the 12.7cm Twin Gun Mount.
::* Autocannons improvements increases the damage for torpedo salvo. (Example: [[25mm Triple Autocannon Mount]] ★+9 shown to increase effective torpedo by 3)
:::*The damage increase is speculated to be the same formula as the 61cm Quad (Oxygen) Torpedo Mount.
::*The effective increase is speculated to be <math> \text {Effective Bonus} = \text {Equipment Type Modifier} \times \sqrt {\text {★ value}}</math>, where the Equipment Type Modifier is 1.5 for large caliber guns and 1.0 otherwise. Decimal values are calculated as well.
:::*Example 1: 12.6cm Twin Gun Mount ★+6 (2.449) and ★+7 (2.645) provides a total of +5 effective bonus.
:::*Example 2: 35.6cm Twin Gun Mount ★+6 (3.674) and ★+5 (3.354) provides a total of +7 effective bonus.
:::*ASW equipment bonus are applied not to the equipment bonus nor the base ASW value, but instead for damage calculation.
:::*The bonus is not applied to [[Expeditions#Support_Expeditions|support shelling fire]].
{| class="mw-collapsible mw-collapsed wikitable"
! colspan="3" | Bonus Details
|-
! style="font-size:15px;"|Equipment Type
! style="font-size:15px;"|Damage the Bonus Applies to
! style="font-size:15px;"|Equipment Type Modifier
|-
| style="text-align:center;"|Small Caliber Gun<br/>Medium Caliber Gun<br/>Secondary Gun
| rowspan="5" style="text-align:center;"|Shelling
| style="text-align:center;"|x1
|-
| style="text-align:center;"|AP Shell
| style="text-align:center;"|x1<br>(Note: ★+5 shown to give +2 bonus, but +3 bonus not confirmed yet)
|-
| style="text-align:center;"|Fire Director<br>Searchlight
| style="text-align:center;"|x1
|-
| style="text-align:center;"|Large Caliber Gun (Daytime)
| style="text-align:center;"|x1.5
|-
| style="text-align:center;"|Large Caliber Gun (Nighttime)
| style="text-align:center;"|x1
|-
| style="text-align:center;"|Torpedo<br/>Autocannon
| style="text-align:center;"|Torpedo
| style="text-align:center;"|x1
|-
| rowspan="2" style="text-align:center;"|Sonar<br/>Depth Charge
| style="text-align:center;"|Shelling
| rowspan="2" style="text-align:center;"|x1
|-
| style="text-align:center;"|ASW
|}
* If the equipment reaches the maximum improvement level (★max), it can sometimes be upgraded into stronger equipment. Be aware that the equipment's improvement level will reset, and a ★+10 equipment could be stronger than its unimproved upgrade.
* If the equipment reaches the maximum improvement level (★max), it can sometimes be upgraded into stronger equipment. Be aware that the equipment's improvement level will reset, and a ★+10 equipment could be stronger than its unimproved upgrade.
** If the new equipment after upgrading is something you can develop from conventional development, the improvement level will be automatically set to ★+3 (or ★+5 in a few cases).
** If the new equipment after upgrading is something you can develop from conventional development, the improvement level will be automatically set to ★+3 (or ★+5 in a few cases).