View source for Help:Akashi Upgrades

=Introduction=
This article aims to provide a rough guide to help you decide on what to spend screws on. 
Because most improvement bonuses are "square-rooted", the first upgrade provides the largest relative gain per screw, therefore it is critical to get relevant important equipment to {{Star}}'''+1''' before working on others. 
''Please refer to:
*''[[Improvement]] for more details on the stat bonuses,
*''[https://akashi-list.me/ Akashi-List] for the costs involved.

===The Breakpoint Myth===
Breakpoints refer to points where upgrade bonuses reach whole numbers. These points are stressed because of the way the game rounds down the results of most formulas. The misconception is that a 1.99 bonus is just as good as a 1.00 bonus because of rounding. While there is a slight grain of truth to the myth, things get a little complex in practice. Due to how many multipliers and other bonuses are involved, trying to hit equipment upgrade breakpoints doesn't affect very much in the grand scheme of things.

The most important thing to do is to upgrade your equipment to certain critical points:
* {{Star}}'''+1''' : Provides the biggest power increase (square-rooted only).
* {{Star}}'''+6''' : The point when failures start to kick in and costs take a jump.
* {{MaxStar}} : The final step to maximize upgrade bonuses.

=Screw Guaranteeing/Saving=
In most cases, it is statistically cheaper to either toggle or not the "guaranteed improvement".

Reminder :
{|class="wikitable" style="text-align:center" style="margin:auto"
!Modification Level 
! 1★!! 2★!! 3★!! 4★!! 5★!! 6★!! 7★!! 8★!! 9★!! Max★!! Upgrade
|-
!Akashi 
| 100% || 100% || 100% || 100% || 95% || 90% || 80% || 77% || 72% || 60% || 50%
|-
!Akashi Kai 
| 100% || 100% || 100% || 100% || 100% || 95% || 90% || 82% || 77% || 67% || 62% 
|}

Average screw cost when not guaranteed, assuming Akashi is Kai and not counting any equipment cost:

[[File:Average costs.png|750px|center]]

As expected, when the guaranteed cost is too high, not guaranteeing the upgrade is on average cheaper screw-wise, but this is not counting any potential equipment that may be lost and so may imply a higher screw cost.

Guaranteeing worthiness per base upgrade screw cost can then be defined as followed:
<tabber>
|-|General rules=
When upgrading any equipment, Devmats and Screw are consumed, and eventually one or several equipment and consumables.
*Since obtaining Devmats is not an issue, their cost is simply ignored.
*Since failing an upgrade does not consume any consumables, they are ignored.
*For equipment consumed :
**If they are craftable or relatively easy to obtain, their cost is negligible in front of any screw cost.
**If the equipment consumed is a very rare one, then guaranteeing the upgrade should be evident.
**If the equipment consumed is itself made via Akashi's upgrades, '''then its total screw cost must be added to the base screw costs used in later examples. 
|-|0=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 0|| 6th {{Star}}
|-
| 1+|| Never
|}

|-|1=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 1|| 6th {{Star}}
|-
| 2+|| Never
|}

|-|2=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 2|| 6th {{Star}}
|-
| 3|| {{MaxStar}}
|-
| 4+|| Never
|}

|-|3=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 3|| 6th {{Star}}
|-
| 4|| 8th {{Star}}
|-
| 5+|| Never
|}

|-|4=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 4|| 6th {{Star}}
|-
| 5|| 8th {{Star}}
|-
| 6|| {{MaxStar}}
|-
| 7+|| Never
|}

|-|5=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 5|| 6th {{Star}}
|-
| 6|| 7th {{Star}}
|-
| 7|| 9th {{Star}}
|-
| 8|| {{MaxStar}}
|-
| 9+|| Never
|}

|-|6=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 6|| 6th {{Star}}
|-
| 7|| 7th {{Star}}
|-
| 8|| 9th {{Star}}
|-
| 9|| {{MaxStar}}
|-
| 10+|| Never
|}

|-|7=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 7|| 6th {{Star}}
|-
| 8|| 7th {{Star}}
|-
| 9|| 8th {{Star}}
|-
| 10|| 9th {{Star}}
|-
| 11|| {{MaxStar}}
|-
| 12+|| Never
|}

|-|8=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 8|| 6th {{Star}}
|-
| 9|| 7th {{Star}}
|-
| 10|| 8th {{Star}}
|-
| 11|| 9th {{Star}}
|-
| 12|| {{MaxStar}}
|-
| 13+|| Never
|}

|-|9=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 9|| 6th {{Star}}
|-
| 10|| 6th {{Star}}
|-
| 11|| 8th {{Star}}
|-
| 12|| 9th {{Star}}
|-
| 13|| 9th {{Star}}
|-
| 14|| {{MaxStar}}
|-
| 15+|| Never
|}

|-|10=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 10|| 6th {{Star}}
|-
| 11|| 6th {{Star}}
|-
| 12|| 7th {{Star}}
|-
| 13|| 9th {{Star}}
|-
| 14|| 9th {{Star}}
|-
| 15|| {{MaxStar}}
|-
| 16|| {{MaxStar}}
|-
| 17+|| Never
|}

|-|11=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 11|| 6th {{Star}}
|-
| 12|| 6th {{Star}}
|-
| 13|| 7th {{Star}}
|-
| 14|| 8th {{Star}}
|-
| 15|| 9th {{Star}}
|-
| 16|| 9th {{Star}}
|-
| 17|| {{MaxStar}}
|-
| 18+|| Never
|}

|-|12=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 12|| 6th {{Star}}
|-
| 13|| 6th {{Star}}
|-
| 14|| 7th {{Star}}
|-
| 15|| 8th {{Star}}
|-
| 16|| 9th {{Star}}
|-
| 17|| 9th {{Star}}
|-
| 18|| {{MaxStar}}
|-
| 19|| {{MaxStar}}
|-
| 20+|| Never
|}

|-|13=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 13|| 6th {{Star}}
|-
| 14|| 6th {{Star}}
|-
| 15|| 7th {{Star}}
|-
| 16|| 8th {{Star}}
|-
| 17|| 9th {{Star}}
|-
| 18|| 9th {{Star}}
|-
| 19|| 9th {{Star}}
|-
| 20|| {{MaxStar}}
|-
| 21+|| Never
|}

|-|14=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 14|| 6th {{Star}}
|-
| 15|| 6th {{Star}}
|-
| 16|| 7th {{Star}}
|-
| 17|| 7th {{Star}}
|-
| 18|| 8th {{Star}}
|-
| 19|| 9th {{Star}}
|-
| 20|| 9th {{Star}}
|-
| 21|| {{MaxStar}}
|-
| 22|| {{MaxStar}}
|-
| 23+|| Never
|}

|-|15=
{|class="wikitable"
!guaranteed cost
!1st time guaranteeing is worth it (in {{Star}})
|-
| 15|| 6th {{Star}}
|-
| 16|| 6th {{Star}}
|-
| 17|| 7th {{Star}}
|-
| 18|| 7th {{Star}}
|-
| 19|| 8th {{Star}}
|-
| 20|| 9th {{Star}}
|-
| 21|| 9th {{Star}}
|-
| 22|| 9th {{Star}}
|-
| 23|| {{MaxStar}}
|-
| 24|| {{MaxStar}}
|-
| 25+|| Never
|}

|-|16+=
There is only one equipment with a base brut screw cost above 15 (the [[SK Radar]]), and as every equipment consuming expensive "Akashi exclusive" or rare equipment, the average screw cost is less important that the raw cost, meaning that guaranteeing the upgrade is always worth it
</tabber>

=Improvement Guide=
{{imbox
| type = content
| text = The following guide was made by few players and has not been scrutinized enough.<br>Beware of potential biases.
}}
Several rankings for equipment improvements. Do note that:
*Equipments to upgrade/improve are ranked from most advisable at '''1''', to least advisable at '''10'''.
*Many equipment possibly improbable are omitted, as they are either:
**Already listed in one of the lists,
**Are obtainable elsewhere for cheaper,
**Are just not worth improving or upgrading.
*Some equipment can be in several lists.

==Quests Improvements==
Several [[Quests]] require specific equipment to be upgraded in order to be completed, while others simply allow the use of upgraded equipment for conversion.

===Quests Requirements===
Here is the list of equipment that required to be improved to complete some quests:
*''All improvements are lost during conversions.

{|class="wikitable mw-collapsible mw-collapsed" style="margin:auto"
|+Quests Requirements
!Quest!!Equipment!!{{Star}} Level !!Notes
|-
|{{Q|F36}} ||[[61cm Triple (Oxygen) Torpedo Mount]]<br>[[61cm Quintuple (Oxygen) Torpedo Mount]] ||{{MaxStar}} ||Both
|-
|{{Q|F51}} ||[[Type 2 Seaplane Fighter Kai]] ||{{MaxStar}}
|-
|{{Q|F52}} ||[[Type 2 Seaplane Fighter Kai]] ||{{MaxStar}}
|-
|{{Q|F58}} ||[[Zuiun (634 Air Group)]] ||{{MaxStar}}
|-
|{{Q|F61}} ||[[F6F-3]] ||{{MaxStar}}
|-
|{{Q|F63}} ||[[F6F-5]] ||{{MaxStar}}
|-
|{{Q|F74}} ||[[Prototype 41cm Triple Gun Mount]] ||{{MaxStar}}
|-
|{{Q|F76}} ||[[12.7cm Twin Gun Mount Model A Kai 2]] ||{{MaxStar}}
|-
|{{Q|F78}} ||[[12.7cm Twin Gun Mount Model B Kai 2]] ||{{MaxStar}}
|-
|{{Q|F87}} ||[[Zuiun Kai Ni (634 Air Group)]] ||{{MaxStar}}
|-
|{{Q|F101}} ||[[Type 0 Reconnaissance Seaplane Model 11B]] ||{{MaxStar}}
|-
|{{Q|F103}} ||[[Type 3 Active Sonar]] ||{{MaxStar}}
|-
|{{Q|F104}} ||[[Daihatsu Landing Craft (Type 89 Medium Tank & Landing Force)]] ||{{MaxStar}}
|-
|{{Q|F105}} ||[[Type 1 Land-based Attack Aircraft Model 22A]] ||{{MaxStar}}|| Requires to craft 8 [[Tenzan Model 12A]]
|-
|{{Q|F111}} ||[[Type 98 Reconnaissance Seaplane (Night Recon)]]<br>[[Type 0 Reconnaissance Seaplane Model 11B]] ||{{MaxStar}} ||Both
|-
|{{Q|F116}} ||[[35.6cm Twin Gun Mount Kai San (Dazzle Camouflage)]] ||{{Star}}+3 ||All {{Star}} past 3 are lost on conversion
|-
|{{Q|F117}} ||[[Late Model Bow Torpedo Mount (6 tubes)]] ||{{MaxStar}}
|-
|{{Q|F120}} ||[[12.7cm Twin Gun Mount Model D Kai 2]] ||{{Star}}+8 ||All {{Star}} past 8 are lost on conversion
|-
|{{Q|F121}} ||[[Type 13 Air Radar Kai (Late Model)]] ||{{Star}}+4 ||All {{Star}} past 4 are lost on conversion
|-
|{{Q|F122}} ||[[Type 22 Surface Radar Kai 4 ]] ||{{MaxStar}}
|-
|{{Q|Fq1}} ||[[Type 96 Fighter]] ||{{MaxStar}}
|-
|{{Q|Fq7}} ||[[12.7cm Twin Gun Mount Model A Kai 2]] ||{{MaxStar}}
|-
|{{Q|Fy2}} ||[[Swordfish]] ||{{MaxStar}}
|-
|{{Q|Fy10}} ||[[Type 0 Reconnaissance Seaplane]] ||{{MaxStar}}
|}

===Ultra Highly Advised===
'''It is highly recommended to improve the following equipment to {{MaxStar}} before proceeding with those quests as {{TextGlow|any {{Star}} are carried over to the reward|black|text-colour=lime|glow-size=2px}}, and {{color|red|the rewards cannot be [[Improvement|improved]] afterward!}}

{|class="wikitable mw-collapsible mw-collapsed" style="margin:auto"
|+Ultra Highly Advised
!Quest!!Equipment
|-
|{{Q|F13}} ||[[Type 97 Torpedo Bomber (Tomonaga Squadron)]]
|-
|{{Q|F14}} ||[[Type 99 Dive Bomber (Egusa Squadron)]]
|-
|{{Q|F15}} ||[[Zero Fighter Model 52C (601 Air Group)]]
|}

===Highly Advised===
In those quests, {{TextGlow|any {{Star}} the equipment has, are carried over to the reward.|black|text-colour=lime|glow-size=2px}} It is therefore advised to upgrade the equipment before completing the quest, as it is cheaper to do so.

{|class="wikitable mw-collapsible mw-collapsed" style="margin:auto"
|+Highly Advised
!Quest!!Equipment!!Notes
|-
|{{Q|F19}} ||[[Type 97 Torpedo Bomber (Murata Squadron)]] ||Not improvable yet
|-
|{{Q|F24}} ||[[Type 0 Fighter Model 21 (Skilled)]] ||rowspan=3|It is advised to start improvements with Fm1 for this chain.
|-
|{{Q|F26}} ||[[Type 0 Fighter Model 52 (Skilled)]]
|-
|{{Q|F27}} ||[[Zero Fighter Model 52C (w/ Iwai Flight)]]
|-
|{{Q|F28}} ||[[Type 0 Fighter Model 21 (Skilled)]] ||rowspan=3|It is advised to start improvements with Fm1 for this chain.
|-
|{{Q|F29}} ||[[Zero Fighter Model 21 (w/ Iwamoto Flight)]]
|-
|{{Q|F30}} ||[[Zero Fighter Model 52A (w/ Iwamoto Flight)]]
|-
|{{Q|Fm1}} ||[[Type 0 Fighter Model 21]] ||Is the start of most improvement quests chains
|-
|{{Q|Fm2}} ||[[Type 0 Fighter Model 21 (Skilled)]] ||It is advised to start improvements with Fm1.
*Good a [[LBAS]] fighter
|}

===Traps===
Some quests allow the use of upgraded equipment for completion, but will not keep any of the current equipment improvements, and so should be cleared with unimproved equipment:

{|class="wikitable mw-collapsible mw-collapsed" style="margin:auto"
|+Traps
!Quest!!Equipment
|-
|{{Q|F40}} ||[[Type 1 Land-based Attack Aircraft]]
|-
|{{Q|F62}} ||[[TBF]]
|-
|{{Q|F86}} ||[[Suisei Model 12A]]
|-
|{{Q|F89}} ||[[7.7mm Machine Gun]]
|-
|{{Q|F107}} ||[[Ki-102 B]]
|-
|{{Q|F112}} ||[[5inch Single Gun Mount Mk.30]]
|-
|{{Q|F115}} ||[[Smoke Generator (Smoke Screen)]]
|-
|{{Q|Fq2}} ||[[Type 96 Land-based Attack Aircraft]]
|-
|{{Q|Fq5}} ||[[Type 0 Fighter Model 52]]
|}

==Collection Improvements==
Some equipment are only obtainable via Akashi upgrades.
*''The list can be found [[Equipment#Unbuildable Equipment|here]]
*If completing the Kancodex is a personal goal, then crafting those equipment becomes a necessity in the long run.
*Making all those equipment should NOT be a priority over the rest, as most are not very useful or even useless.
*See below for when making those equipment overlap with advised improvements.

==Upgrade Advice==
Here is a list of improvements that have as a main goal to "'''upgrade'''" said equipment into a better one.
*Do that certain upgrades can be done in chains, with part of the chain ranging from worse than the upgrade, equivalent to, or even better.
*The "Total Srew Cost" is given as an indication, but does not reflect "real" with [[#Screw Guaranteeing/Saving|guaranteeing savings]] and consumed equipment being great factors to take into account.
*Several good equipment are not listed there as they can be obtained otherwise more cheaply, or because the upgrade is just not worth it.

{|class="wikitable mw-collapsible mw-collapsed sortable" style="margin:auto"
|+Upgrade Advice
|-
! Priority Level
! Equipment Goal
! Equipment To Upgrade
! Total Srew Cost
! Further Improvable?
! Other Sources
! Notes
|-
! 6
| [[41cm Triple Gun Mount Kai]]
| [[Prototype 41cm Triple Gun Mount]]
| 69
| Yes
| N/A
| A good gun for BB(V), further upgradable.
*The Prototype 41cm is also useful in the making
|-
! 8
| [[41cm Twin Gun Mount Kai 2]]
| [[41cm Triple Gun Mount Kai]]
| 92
| Yes
| {{Q|B130}}
| A good gun for BB(V), especially IJN ones
*The 41cm Kai is also useful in the making
*Consumes 1 [[Prototype 46cm Twin Gun Mount]]
|-
! 6
| [[41cm Triple Gun Mount Kai 2]]
| [[41cm Triple Gun Mount Kai]]
| 93
| Yes
| {{Q|F74}}
| A good gun for BB(V), especially IJN ones
*The 41cm Kai is also useful in the making
|-
! 2
| [[12cm 30 Tube Rocket Launcher Kai 2]]
| [[12cm 30-tube Rocket Launcher]]
| 40
| Yes
| {{Q|B114}}
| Needed to trigger the "[[AARB]]" that negate some plane damages
*A goal is to 6, enough to equip a full "carrier fleet".
|-
! 2
| [[Type 2 Seaplane Fighter Kai]]
| [[Type 0 Reconnaissance Seaplane]]
| 40
| Yes
| {{Q|B88}}
| Good to maintain airpower without carriers
*The goal is to have at least 6 good [[SPF]]
|-
! 3
| [[Kyoufuu Kai]]
| [[Type 2 Seaplane Fighter Kai]]
| 77
| Yes
| {{Q|B95}}, {{Q|B167}}
| Great to maintain airpower without carriers
*The T2 SPF Kai is also useful in the making
*The goal is to have at least 6 good [[SPF]]
|-
! 2
| [[Type 1 Armor Piercing Shell]]
| [[Type 91 Armor Piercing Shell]]
| 22
| Yes
| {{Q|B31}}, {{Q|B32}}
| Good AP shell improving some [[Artillery Spotting]], cheap to make
|-
! 10
| [[Type 1 Armor Piercing Shell Kai]]
| [[Type 1 Armor Piercing Shell]]
| 35
| Yes
| N/A
| The best AP shell improving some [[Artillery Spotting]], but extremely expensive
|-
! 1
| [[Special Type 2 Amphibious Tank]]
| [[Daihatsu Landing Craft (Type 89 Medium Tank & Landing Force)]]
| 39
| Yes
| {{Q|F33}}
| Great against [[Installation]]s in all cases, and can serve for [[Resource Node|resource farming]]
|-
! 1
| [[Daihatsu Landing Craft (Type 89 Medium Tank & Landing Force)]]
| [[Daihatsu Landing Craft]]
| 24
| Yes
| N/A
| Great against [[Installation]]s in all cases
|-
! 4
| [[Toku Daihatsu Landing Craft]]
| [[Daihatsu Landing Craft]]
| 29
| Yes
| {{Q|B85}}
| Good for [[Expeditions]], increasing the gains
|-
! 5
| [[Armed Daihatsu]]
| [[Daihatsu Landing Craft]]
| 23
| Yes
| N/A
| Great against [[Installation]]s and [[PT Imp]]s
*Consumes a [[Daihatsu Landing Craft (Type 89 Medium Tank & Landing Force)]]
|-
! 5
| [[F6F-5]]
| [[F6F-3]]
| 70
| Yes
| N/A
| A +10 airpower fighter, great to reach air superiority
|-
! 7
| [[Type 0 Fighter Model 64 (Skilled Fighter-bomber)]]
| [[Type 0 Fighter Model 64 (Air Superiority Fighter Specification)]]
| 70
| Yes
| N/A
| Good all round fighter-bomber with [[AAR]]
|-
! 5
| [[Shiden Kai 4]]
| [[Shiden Kai 2]]
| 59
| Yes
| N/A
| +10 airpower fighter, great to reach air superiority
|-
! 8
| [[Seafire Mk.III Kai]]
| [[Spitfire Mk.V]]
| 49
| No
| N/A
| Good fighter, with bonuses in some "European Events"
|-
! 3
| [[Spitfire Mk.V]]
| [[Spitfire Mk.I]]
| 33
| Yes
| N/A
| Great interceptor, further improbable, with bonuses in some "European Events"
|-
! 6
| [[Re.2005 Kai]]
| [[Re.2001 CB Kai]]
| 60
| No
| N/A
| +11 airpower fighter, with bonuses in some "European Events"
|-
! 10
| [[Re.2001 CB Kai]]
| [[Re.2001 OR Kai]]
| 49
| Yes
| N/A
| Only used to make the [[Re.2005 Kai]]
|-
! 10
| [[Fulmar (Reconnaissance Fighter/Skilled)]]
| [[Fulmar]]
| 39
| No
| N/A
| Only useful in some "European Events"
|-
! 9
| [[Type 99 Dive Bomber Model 22 (Skilled)]]
| [[Type 99 Dive Bomber Model 22]]
| 36
| Yes
| N/A
| A medium [[Anti-Installation]] dive-bomber
|-
! 6
| [[SB2C-3]]
| [[SBD-5]]
| 43
| No
| N/A
| Good [[Anti-Installation]] dive-bomber, with bonuses in some "European Events"
|-
! 8
| [[Prototype Type 97 Torpedo Bomber Kai (Skilled) No. 3 Model E (w/ Type 6 Airborne Radar Kai)]]
| [[Type 97 Torpedo Bomber (Skilled)]]
| 45
| No
| N/A
| A good night bomber
|-
! 10
| [[Tenzan Model 12A]]
| [[Tenzan]]
| 34
| Yes
| {{Q|B169}}
| Ok torpedo bomber, mostly used to improve the [[Type 1 Land-based Attack Aircraft Model 22A]]
|-
! 9
| [[Tenzan Model 12A Kai (w/ Type 6 Airborne Radar Kai)]]
| [[Prototype Type 97 Torpedo Bomber Kai No. 3 Model E (w/ Type 6 Airborne Radar Kai)]]
| 63
| No
| {{Q|B154}}, {{Q|B169}}
| Best craftable night bomber
|-
! 5
| [[Jet Keiun Kai]]
| [[Prototype Keiun (Carrier-based Reconnaissance Model)]]
| 86
| No
| N/A
| A [[Jet]], coming with unique behaviors and great stats
|-
! 8
| [[Type 2 Two-seat Fighter Toryuu Model C]]
| [[Type 2 Two-seat Fighter Toryuu]]
| 33
| Yes
| N/A
| OK interceptor, mostly a step towards the Ki-96
|-
! 3
| [[Ki-96]]
| [[Type 2 Two-seat Fighter Toryuu Model C]]
| 38
| Yes
| N/A
| Best craftable interceptor
|-
! 8
| [[Ki-102 B]]
| [[Ki-96]]
| 60
| No
| N/A
| Good LBB stat-wise, but with low range
|-
! 5
| [[Type 1 Fighter Hayabusa Model III A]]
| [[Type 1 Fighter Hayabusa Model II]]
| 39
| Yes
| N/A
| Good interceptor
|-
! 6
| [[Shiden Kai (343 Air Group) 301st Fighter Squadron]]
| [[Shiden Model 21 Shiden Kai]]
| 71
| No
| N/A
| Great interceptor
|-
! 7
| [[Do 217 E-5 + Hs293 Initial Model]]
| [[Do 17 Z-2]]
| 63
| No
| N/A
| A great LBB with [[AAR]] but with low range, with bonuses in some "European Events"
|-
! 10
| [[Type 1 Land-based Attack Aircraft Model 34]]
| [[Type 1 Land-based Attack Aircraft Model 22A]]
| 56
| Yes
| {{Q|B154}}
| Best craftable LBB, but is the most expensive equipment in the game:
*Consumes 8 [[Tenzan Model 12A]]
|-
! 7
| [[Type 4 Heavy Bomber Hiryuu (Skilled)]]
| [[Type 4 Heavy Bomber Hiryuu]]
| 72
| No
| N/A
| A great LBB with [[AAR]] but with low range
|-
! 10
| [[12cm Single Gun Mount Kai 2]]
| [[12cm Single Gun Mount]]
| 19
| Yes
| N/A
| A good very niche small gun
|-
! 9
| [[Prototype Long-barrel 12.7cm Twin Gun Mount Model A Kai 4]]
| [[12.7cm Twin Gun Mount Model A Kai 2]]
| 38
| Yes
| {{Q|B179}}
| A good very niche small gun, with great bonuses on some IJN ships
|-
! 3
| [[5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37]]
| [[5inch Single Gun Mount Mk.30 Kai]]
| 101
| No
| N/A
| Best [[AACI]] small gun, with high AA, and required in some [[AACI]]
|-
! 9
| [[12.7cm Twin Gun Mount Model C Kai 3]]
| [[12.7cm Twin Gun Mount Model C Kai 2]]
| 34
| Yes
| {{Q|B184}}, {{Q|B192}}
| A good small gun, with great bonuses on some IJN ships
|-
! 5
| [[14cm Twin Gun Mount Kai]]
| [[14cm Twin Gun Mount]]
| 17
| Yes
| {{Q|B140}}, {{Q|F118}}
| Great medium gun on some IJN ships with fit bonuses
*Rarely more than 4 are needed
|-
! 3
| [[15.2cm Twin Gun Mount Kai 2]]
| [[15.2cm Twin Gun Mount Kai]]
| 44
| Yes
| {{Q|B164}}, {{Q|B168}}, {{Q|C57}}
| Best CL gun, with good FP and great Acc
|-
! 3
| [[15.2cm Twin Gun Mount Kai]]
| [[15.2cm Twin Gun Mount]]
| 36
| Yes
| {{Ship/Link|Noshiro Kai Ni}}, {{Q|F118}}
| Best CL gun in the game, with good FP and great Acc
|-
! 9
| [[15.5cm Triple Gun Mount Kai]]
| [[15.5cm Triple Gun Mount]]
| 34
| Yes
| N/A
| Good CL gun with higher FP
|-
! 8
| [[15.5cm Triple Secondary Gun Mount Kai]]
| [[15.5cm Triple Secondary Gun Mount]]
| 34
| Yes
| N/A
| Good surface secondary gun, especially for CLT or in cases of air parity or worse
|-
! 5
| [[15.5cm Triple Secondary Gun Mount Kai 2]]
| [[15.5cm Triple Secondary Gun Mount Kai]]
| 53
| No
| {{Q|B181}}, {{Q|B182}} x2
| Best surface secondary gun, especially for CLT or in cases of air parity or worse
|-
! 10
| [[8inch Triple Gun Mount Mk.9 mod.2]]
| [[8inch Triple Gun Mount Mk.9]]
| 42
| Yes
| N/A
| Best cruiser gun for FP, useful on CA in Main [[Combined Fleet]]s
|-
! 7
| [[35.6cm Triple Gun Mount Kai (Dazzle Camouflage)]]
| [[35.6cm Twin Gun Mount (Dazzle Camouflage)]]
| 43
| Yes
| N/A
| Great gun for FBB, with good stats, especially Acc
|-
! 6
| [[35.6cm Twin Gun Mount Kai 3 (Dazzle Camouflage)]]
| [[35.6cm Triple Gun Mount Kai (Dazzle Camouflage)]]
| 70
| Yes
| {{Q|B190}}, {{Q|C74}}
| Great gun for FBB, with good stats, especially Acc
|-
! 9
| [[16inch Mk.VIII Twin Gun Mount Kai]]
| [[16inch Mk.V Twin Gun Mount]]
| 56
| Yes
| N/A
| Good gun for BB(V) with medium stats
|-
! 10
| [[38.1cm Mk.I/N Twin Gun Mount Kai]]
| [[38.1cm Mk.I Twin Gun Mount]]
| 48
| Yes
| N/A
| Good gun for FBB with medium stats
|-
! 9
| [[16inch Mk.I Triple Gun Mount Kai + FCR Type 284]]
| [[16inch Mk.I Triple Gun Mount + AFCT Kai]]
| 68
| Yes
| N/A
| Good gun for BB(V) with high Acc, and used is an [[AACI]]
|-
! 7
| [[46cm Triple Gun Mount Kai]]
| [[46cm Triple Gun Mount]]
| 69
| Yes
| {{Q|B182}}
| Very niche, with long range, good FP and Acc, best gun for the ''Yamato''-class
|-
! 10
| [[51cm Twin Gun Mount]]
| [[Prototype 51cm Twin Gun Mount]]
| 85
| Yes
| N/A
| Very niche, mostly used for its great FP
|-
! 5
| [[16inch Triple Gun Mount Mk.7 + GFCS]]
| [[16inch Triple Gun Mount Mk.7]]
| 100
| Yes
| N/A
| Great gun for (F)BB(V) with high Acc
|-
! 7
| [[8cm High-angle Gun Kai + Additional Machine Guns]]
| [[8cm High-angle Gun]]
| 49
| Yes
| {{Q|B96}}, {{Q|B167}}, {{Q|B169}}
| Used for [[RE]] usage only, to maintain [[Artillery Spotting]] on some ships
|-
! 9
| [[Type C Kouhyouteki]]
| [[Type A Kouhyouteki]]
| 28
| No
| {{Q|B167}}
| A better Minisub at +14 torpedo stat
|-
! 5
| [[Type 13 Air Radar Kai (Late Model)]]
| [[Type 13 Air Radar Kai]]
| 55
| Yes
| N/A
| A dual-purpose radar, with good bonuses and usable in the [[RE]] of some IJN ships
|-
! 6
| [[15m Duplex Rangefinder Kai + Type 21 Radar Kai 2 + Skilled Fire Direction Center]]
| [[15m Duplex Rangefinder + Type 21 Radar Kai 2]]
| 80
| Yes
| N/A
| A dual-purpose radar providing LoS, Acc, and AA, great for all (F)BB(V), especially the ''Yamato''-class
*The base Duplex is also useful in the making
|-
! 10
| [[SK + SG Radar]]
| [[SK Radar]]
| 94
| Yes
| N/A
| A dual-purpose radar, with only LoS as a good stat
|-
! 9
| [[Type 32 Surface Radar Kai]]
| [[Type 32 Surface Radar]]
| 58
| Yes
| N/A
| Best large surface radar, providing LoS and Acc
|-
! 6
| [[Type 4 Passive Sonar]]
| [[Type 93 Passive Sonar]]
| 29
| Yes
| {{Q|B74}}
| Good sonar at +12 ASW, helping to reach some [[OASW]]
|-
! 5
| [[Type144/147 ASDIC]]
| [[Type124 ASDIC]]
| 57
| No
| {{Ship/Link|Janus Kai}}
| Good sonar at +13 ASW, helping to reach some [[OASW]]
|-
! 10
| [[Type 3 Shell Kai]]
| [[Type 3 Shell]]
| 60
| Yes
| N/A
| Only gives marginal stat boost and fit bonuses
|-
! 7
| [[QF 2-pounder Octuple Pom-pom Gun Mount]]
| [[Bi Type 40mm Twin Autocannon Mount]]
| 19
| Yes
| {{Ship/Link|Ark Royal Kai}}, {{Ship/Link|Warspite Kai}}
| Great AA gun useful in [[AACI]], very cheap
|-
! 6
| [[Zuiun Model 12 (634 Air Group)]]
| [[Zuiun Model 12]]
| 69
| Yes
| N/A
| Good SPB with [[AAR]], providing LoS, bombing, and other stats, further upgradeable and consumed to improve later variants
|-
! 4
| [[Zuiun (634 Air Group/Skilled)]]
| [[Zuiun Model 12 (634 Air Group)]]
| 56
| Yes
| {{Q|F58}}
| Great SPB with [[AAR]], providing LoS, bombing, and other stats, further upgradeable
|-
! 3
| [[Zuiun Kai 2 (634 Air Group)]]
| [[Zuiun (634 Air Group/Skilled)]]
| 86
| Yes
| {{Q|B132}}
| Great SPB with [[AAR]], providing LoS, bombing, and other stats, further upgradeable
|-
! 1
| [[Prototype Night Zuiun (Attack Equipment)]]
| [[Zuiun Kai 2 (634 Air Group)]]
| 110
| Yes
| N/A
| Best SPB, with a special [[Night Cut-In]] 
|-
! 10
| [[S-51J Kai]]
| [[S-51J]]
| 96
| Yes
| N/A
| Best ASW aircraft, but extremely niche, serving for some [[OASW]]
|-
! 6
| [[Type 4 20cm Anti-ground Rocket Launcher (Concentrated Deployment)]]
| [[Shipborne Model Type 4 20cm Anti-ground Rocket Launcher]]
| 53
| No
| N/A
| Good for [[Anti-Installation]] only, giving some side bonuses, and equipable on more ships than "landing equipment"
|-
! 4
| [[Ryuusei Kai (Skilled)]]
| [[Ryuusei Kai]]
| 47
| Yes
| N/A
| Great torpedo bomber with [[AAR]]
|}

==Improvement Advice==
Here is a list of improvements that have as a main goal to "'''enhance'''" said equipment's [[stats]].
*In some cases, the equipment can be upgraded, but the upgrade is inferior to the improved base equipment,
*In some cases, the improved equipment only shows its best potential on certain ships, thanks to [[Visible Fit Bonuses]],
*Some of the listed equipment below are obtained from [[#Upgrade Advice|above listed upgrades]],
*Equipment being improved only for upgrade purposes are not listed there,
*The improvements related to [[#Quests Improvements|Quests]] are not listed there, and should be done with the quests in mind.

{|class="wikitable mw-collapsible mw-collapsed sortable" style="margin:auto"
|+Improvement Advice
! Priority Level
! Equipment
! Base Screw Cost
! Notes
|-
! 1
| [[Combat Ration]]
| 0
| Only used to farm screws with {{Q|Fd6}}
|-
! 1
| [[Shiden Kai 4]]
| 4
| +12 airpower fighter, great to reach air superiority
|-
! 3
| [[F6F-5]]
| 6
| +12 airpower fighter, great to reach air superiority
|-
! 7
| [[Type 0 Fighter Model 64 (Air Superiority Fighter Specification)]]
| 5
| +11 airpower fighter, great to reach air superiority
|-
! 5
| [[Type 0 Fighter Model 64 (Skilled Fighter-bomber)]]
| 6
| Good all round fighter-bomber with [[AAR]]
|-
! 10
| [[Type 0 Fighter Model 64 (Two-seat w/ KMX)]]
| 5
| Very niche fighter-bomber with ASW
|-
! 9
| [[Type 99 Dive Bomber Model 22 (Skilled)]]
| 3
| Medium [[Anti-Installation]] dive-bomber
|-
! 10
| [[Swordfish Mk.II (Skilled)]]
| 3
| Torpedo bomber with bonuses in some "European Events"
|-
! 9
| [[TBF]]
| 3
| Torpedo bomber with bonuses in some "European Events"
|-
! 10
| [[Type 2 Reconnaissance Aircraft]]
| 3
| Ultra niche role as a [[Range]] extender
|-
! 3
| [[Ki-96]]
| 4
| Great interceptor in all cases
|-
! 5
| [[Type 1 Fighter Hayabusa Model III A]]
| 4
| Good interceptor and a decent LB fighter
|-
! 2
| [[Spitfire Mk.V]]
| 3
| Great interceptor and a decent LB fighter, with bonuses in some "European Events"
|-
! 10
| [[Bomb-carrying Type 1 Fighter Hayabusa Model III Kai (65th Squadron)]]
| 4
| Best LBB, but against DD only
|-
! 4
| [[Type 1 Land-based Attack Aircraft Model 34]]
| 5
| Great LBB, with high stats and good range
|-
! 9
| [[Type 1 Land-based Attack Aircraft (Hachiman Force)]]
| 3
| Good LBB, with good stats and good range, cheap
|-
! 5
| [[Type 1 Land-based Attack Aircraft (Nonaka Squadron)]]
| 5
| Great LBB with [[AAR]], high stats and good range
|-
! 10
| [[12cm Single Gun Mount Kai 2]]
| 2
| A good very niche small gun, cheap
|-
! 8
| [[12.7cm Twin Gun Mount Model A Kai 2]]
| 2
| A good small gun with great bonuses on some IJN ships, further upgradable, cheap
|-
! 5
| [[Prototype Long-barrel 12.7cm Twin Gun Mount Model A Kai 4]]
| 3
| A good very niche small gun, with great bonuses on some IJN ships
|-
! 4
| [[12.7cm Twin Gun Mount Model A Kai 3 (Wartime Modification) + Anti-Aircraft Fire Director]]
| 4
| A great niche small gun for [[AACI]], with great bonuses on some IJN ships 
|-
! 9
| [[12.7cm Single High-angle Gun Mount (Late Model)]]
| 2
| Only one, very niche use as an Acc boost on [[Yura]]
|-
! 6
| [[12.7cm Twin Gun Mount Model C Kai 2]]
| 2
| A good small gun, with great bonuses on some IJN ships
|-
! 3
| [[12.7cm Twin Gun Mount Model C Kai 3]]
| 5
| A good small gun, with great bonuses on some IJN ships
|-
! 1
| [[12.7cm Twin Gun Mount Model D Kai 2]]
| 5
| Best DD gun, with special bonuses for [[Night Cut-In]]s
|-
! 9
| [[130mm B-13 Twin Gun Mount]]
| 5
| A good niche small gun with FP
|-
! 6
| [[5inch Single Gun Mount Mk.30 Kai]]
| 7
| A good small gun for [[AACI]], required in some, further upgradeable
|-
! 3
| [[12.7cm Twin Gun Mount Model B Kai 4 (Wartime Modification) + Anti-Aircraft Fire Director]]
| 6
| A great small gun for [[AACI]], with great bonuses on some IJN ships
|-
! 1
| [[10cm Twin High-angle Gun Mount + Anti-Aircraft Fire Director]]
| 3
| 2nd best [[AACI]] small gun, great on all DD as a default gun choice
* No more than 10 are needed
|-
! 4
| [[14cm Twin Gun Mount Kai]]
| 3
| Great medium gun on some IJN ships with fit bonuses
*Rarely more than 4 are needed
|-
! 6
| [[Bofors 15.2cm Twin Gun Mount Model 1930]]
| 3
| Good CL gun, with good FP and great Acc
|-
! 5
| [[15.2cm Twin Gun Mount Kai]]
| 2
| Great CL gun, with good FP and great Acc
|-
! 1
| [[15.2cm Twin Gun Mount Kai 2]]
| 3
| The Best CL gun, with good FP and great Acc
|-
! 8
| [[15.5cm Triple Gun Mount Kai]]
| 4
| Good CL gun with higher FP
|-
! 2
| [[20.3cm (No.2) Twin Gun Mount]]
| 2
| Great CA gun with high FP and Acc
|-
! 1
| [[20.3cm (No.3) Twin Gun Mount]]
| 2
| Great CA gun with high FP and Acc
|-
! 6
| [[8inch Triple Gun Mount Mk.9]]
| 2
| 2nd best cruiser gun for FP, useful on CA in Main [[Combined Fleets]]
|-
! 4
| [[8inch Triple Gun Mount Mk.9 mod.2]]
| 3
| Best cruiser gun for FP, useful on CA in Main [[Combined Fleets]]
|-
! 7
| [[16inch Triple Gun Mount Mk.6 mod.2]]
| 4
| Good gun for BB(V) with medium stats
|-
! 4
| [[16inch Triple Gun Mount Mk.7 + GFCS]]
| 8
| Great gun for (F)BB(V) with high Acc
|-
! 9
| [[16inch Mk.VIII Twin Gun Mount Kai]]
| 5
| Good gun for BB(V) with medium stats
|-
! 8
| [[16inch Mk.I Triple Gun Mount Kai + FCR Type 284]]
| 5
| Good gun for BB(V) with high Acc, and used is an [[AACI]]
|-
! 10
| [[30.5cm Triple Gun Mount Kai]]
| 4
| Good gun for Gangut only
|-
! 9
| [[38.1cm Mk.I/N Twin Gun Mount Kai]]
| 3
| Good gun for BB(V) with high Acc, and used is an AACI
|-
! 10
| [[38cm Twin Gun Mount Kai]]
| 3
| Medium gun for FBB with medium stats
|-
! 4
| [[35.6cm Triple Gun Mount Kai (Dazzle Camouflage)]]
| 4
| Great gun for FBB, with good stats, especially Acc
|-
! 4
| [[35.6cm Twin Gun Mount Kai 3 (Dazzle Camouflage)]]
| 6
| Great gun for FBB, with good stats, especially Acc
|-
! 2
| [[38cm Quadruple Gun Mount Kai]]
| 7
| Great gun for all (F)BB(V), especially FBB, with great stats, especially Acc
|-
! 4
| [[41cm Triple Gun Mount Kai 2]]
| 7
| A great gun for BB(V), especially IJN ones
|-
! 4
| [[41cm Triple Gun Mount Kai 2]]
| 7
| A great gun for BB(V), especially IJN ones
|-
! 5
| [[46cm Triple Gun Mount Kai]]
| 7
| Very niche, with long range, good FP and Acc, best gun for the ''Yamato''-class
|-
! 8
| [[51cm Twin Gun Mount]]
| 7
| Very niche, mostly used for its great FP
|-
! 4
| [[8cm High-angle Gun Kai + Additional Machine Guns]]
| 4
| Used for [[RE]] usage only, to maintain [[Artillery Spotting]] on some ships
|-
! 8
| [[90mm Single High-angle Gun Mount]]
| 1
| Good for [[AACI]], very cheap
|-
! 9
| [[10cm Twin High-angle Gun Mount Kai + Additional Machine Guns]]
| 4
| Used for [[RE]] usage only, to maintain [[Artillery Spotting]] on some ships
|-
! 5
| [[10cm Twin High-angle Gun Mount Battery Concentrated Deployment]]
| 5
| Best secondary gun for [[AACI]]
|-
! 8
| [[15.2cm Triple Gun Mount]]
| 6
| OK secondary with bonuses on French ships
|-
! 5
| [[15.5cm Triple Secondary Gun Mount Kai]]
| 4
| Good surface secondary gun, especially for CLT or in cases of air parity or worse
|-
! 2
| [[OTO 152mm Triple Rapid Fire Gun Mount]]
| 2
| 2nd best surface secondary gun, especially for CLT or in cases of air parity or worse
|-
! 7
| [[53cm Twin Torpedo Mount]]
| 1
| Only one, very niche, cheap
|-
! 5
| [[533mm Quintuple Torpedo Mount (Initial Model)]]
| 3
| Only good for USN ships
|-
! 4
| [[61cm Triple (Oxygen) Torpedo Mount Late Model]]
| 3
| Best torpedo for some IJN ships
|-
! 3
| [[61cm Quadruple (Oxygen) Torpedo Mount]]
| 1
| Only one, very cheap
|-
! 1
| [[61cm Quadruple (Oxygen) Torpedo Mount Late Model]]
| 3
| Best torpedo in most situation, especially on some IJN ships
|-
! 2
| [[61cm Quintuple (Oxygen) Torpedo Mount]]
| 3
| Great torpedo for most ships
|-
! 2
| [[61cm Quintuple (Oxygen) Torpedo Mount]]
| 5
| Great torpedo for most ships
|-
! 7
| [[Type 13 Air Radar Kai (Late Model)]]
| 3
| A dual-purpose radar, with good bonuses and usable in the [[RE]] of some IJN ships
|-
! 8
| [[SG Radar (Initial Model)]]
| 6
| Best small dual-purpose radar, should become upgradable in the future, very expensive
|-
! 8
| [[Type 21 Air Radar Kai 2]]
| 5
| Great dual-purpose radar for some ships
|-
! 10
| [[SK + SG Radar]]
| 6
| A dual-purpose radar, with only LoS as a good stat
|-
! 6
| [[Type 32 Surface Radar Kai]]
| 5
| Best large surface radar, providing LoS and Acc
|-
! 5
| [[Type 3 Active Sonar]]
| 2
| Good for ASW, cheap
|-
! 3
| [[Type 3 Active Sonar Kai]]
| 4
| Good for ASW, with some bonuses on IJN ships
|-
! 3
| [[Type 4 Passive Sonar]]
| 3
| Good for ASW, cheap
|-
! 10
| [[Type 0 Passive Sonar]]
| 3
| Unusable on most ASW ships, gives bonuses on some ships
|-
! 4
| [[Type 2 Depth Charge]]
| 2
| Good for ASW, with AP, cheap
|-
! 6
| [[Type 3 Depth Charge Projector]]
| 2
| Good for ASW, cheap
|-
! 8
| [[Type 3 Depth Charge Projector (Concentrated Deployment)]]
| 3
| Good for ASW
|-
! 3
| [[Type 2 Depth Charge Kai 2]]
| 3
| Good for ASW, with AP
|-
! 2
| [[Type 91 Armor Piercing Shell]]
| 1
| Good to improve some [[Artillery Spotting]], cheap, further upgradeable
|-
! 1
| [[Type 1 Armor Piercing Shell]]
| 1
| Good to improve some [[Artillery Spotting]], further upgradeable
|-
! 10
| [[Type 1 Armor Piercing Shell Kai]]
| 7
| Good to improve some [[Artillery Spotting]]
|-
! 1
| [[Type 3 Shell]]
| 4
| Only gives marginal stat boost, further upgradeable
|-
! 2
| [[Type 3 Shell Kai]]
| 6
| Only gives marginal stat boost and fit bonuses with improvement 
|-
! 4
| [[Type 3 Shell Kai 2]]
| 6
| Only gives marginal stat boost and fit bonuses with improvement 
|-
! 4
| [[2cm Flakvierling 38]]
| 3
| Has great fit bonuses, can be used in some [[AACI]]
|-
! 1
| [[12cm 30-tube Rocket Launcher Kai 2]]
| 4
| Needed to trigger the "AARB" that negates some plane damages, can be used in some [[AACI]]
|-
! 5
| [[25mm Triple Autocannon Mount (Concentrated Deployment)]]
| 3
| Good AA gun for [[AACI]]
|-
! 2
| [[Type 94 Anti-Aircraft Fire Director]]
| 2
| Great to provide Acc via [[RE]] on most ships, also used for some [[AACI]]
|-
! 10
| [[New Model High Temperature High Pressure Boiler]]
| 8
| Good at +7 only, to gain [[Speed]] bonuses, but cheaper elsewhere
|-
! 5
| [[New Kanhon Design Anti-torpedo Bulge (Medium)]]
| 6
| Good to provide armor
|-
! 10
| [[Pugliese Underwater Protection Bulkhead]]
| 4
| Can provide armor on some Italian ships
|-
! 5
| [[New Kanhon Design Anti-torpedo Bulge (Large)]]
| 6
| Good to provide armor
|-
! 2
| [[Searchlight]]
| 2
| Only one, for some [[Night Battle]] cases
|-
! 10
| [[Type 96 150cm Searchlight]]
| 3
| Only one, mostly inferior to the base one
|-
! 10
| [[Swordfish Mk.II Kai (Reconnaissance Seaplane Model)]]
| 3
| Good on some European ships
|-
! 3
| [[Type 0 Observation Seaplane]]
| 2
| Good on most ships, cheap
|-
! 3
| [[Type 0 Reconnaissance Seaplane Model 11B]]
| 4
| Great recon for all ships
|-
! 9
| [[Fairey Seafox Kai]]
| 4
| Good on some European ships
|-
! 3
| [[Shiun]]
| 4
| Best LoS recon
|-
! 5
| [[Ro.44 Seaplane Fighter bis]]
| 4
| good to maintain airpower without carriers
|-
! 2
| [[Type 2 Seaplane Fighter Kai (Skilled)]]
| 7
| Great to maintain airpower without carriers
|-
! 2
| [[Kyoufuu Kai]]
| 4
| Great to maintain airpower without carriers
|-
! 2
| [[Kyoufuu Kai 2]]
| 7
| Great to maintain airpower without carriers, best SPF
|-
! 10
| [[Laté 298B]]
| 3
| Niche French SPB
|-
! 5
| [[Zuiun (634 Air Group/Skilled)]]
| 6
| Great SPB with [[AAR]], providing LoS, bombing, and other stats, further upgradeable
|-
! 3
| [[Zuiun Kai 2 (634 Air Group)]]
| 8
| Great SPB with [[AAR]], providing LoS, bombing, and other stats, further upgradeable
|-
! 10
| [[S-51J Kai]]
| 8
| Best ASW aircraft, but extremely niche, serving for some [[OASW]]
|-
! 11
| [[Type 3 Command Liaison Aircraft Kai]]
| 3
| Good ASW, but almost useless
|-
! 1
| [[Daihatsu Landing Craft (Type 89 Medium Tank & Landing Force)]]
| 2
| Great against [[Installations]] in all cases
|-
! 1
| [[Special Type 2 Amphibious Tank]]
| 2
| Great against [[Installations]] in all cases, and can serve for [[Resource Node|resource farming]]
|-
! 6
| [[Toku Daihatsu Landing Craft]]
| 2
| Good for [[Expeditions]], increasing the gains
|-
! 3
| [[Soukoutei (Armored Boat Class)]]
| 2
| Great against [[Installation]]s and [[PT Imp]]s
|-
! 3
| [[Armed Daihatsu]]
| 3
| Great against [[Installation]]s and [[PT Imp]]s
|-
! 5
| [[Skilled Deck Personnel + Aviation Maintenance Hands]]
| 2
| For CV(B/L) [[RE]] usage only to improve combat effectiveness
|}

==Improvement Traps==
Here is a list of equipment that '''should NOT''' be upgraded, as they are needed to upgrade better equipment, and thus upgrading them renders them less valuable.
*Additionaly, so far, [[Submarine Equipment]] do not gain any stat from improvement.

{|class="wikitable mw-collapsible mw-collapsed sortable" style="margin:auto"
|+Improvement Traps
! Equipment
|-
| [[Prototype 35.6cm Triple Gun Mount]]
|-
| [[Prototype 46cm Twin Gun Mount]]
|-
| [[Type 22 Surface Radar Kai 4]]
|-
| [[Type 21 Air Radar Kai]]
|-
| [[Zuiun Model 12 (634 Air Group)]]
|-
| [[Tenzan Model 12A]]
|}

=See Also=
{{Help}}