View source for World 4/4-1

{{World/Hub}}
==World 4-1: ジャム島沖 Jam Island==
{{LabSortieworld
| page = World 4/4-1
| difficulty = ☆ ☆ ☆ ☆ ☆
| item = {{fuel}}
| exp = 310
| code = ジャム島攻略作戦 ([[wikipedia:Battle_of_the_Java_Sea|Jam Island Capture Tactics]])
| jptext = 	西方作戦の第一段階として艦隊をジャム島攻略に展開！作戦を実施せよ！　(対潜警戒も厳とせよ)
| entext = As the first phase of Western operation, you are going to deploy your fleet on the Jam Island. Conduct this operation! (Lookout for enemy submarines strictly too.)
| aircon = 
{{AirControlSystem
| Map = 4-1 Light Fleet
| Fleet = 1CA(V), 1CL, 4DD
| Route = Random.<br>{{MapRoute|A|red|B|green|D|red|H|red|J|red}}<br>{{MapRoute|C|red|F|blue|H|red|J|red}}
| AS= 36
}}
{{AirControlSystem
| Map = 4-1 Heavy Fleet
| Fleet = 2CV(L), 1CLT, 3XX (XX can't be (F)BB(V) or CV(L))
| Route = Random.<br>{{MapRoute|A|red|B|green|D|red|G|red|J|red}}<br>{{MapRoute|C|red|F|blue|D|red|G|red|J|red}}
| AS= 36
}}
}}
===Map Unlocking & Progression===
'''4-1''' is unlocked after clearing [[2-4]].

To clear the map, the boss's flagship must be sunk once.

===Stage Guide===
{{MapBranchingTable
|title = 4-1 Branching Rules
|id = 4-1

|0 -> A, C = *Random routing

|C -> E, F/empty = 
* If (F)BB(V)+CV(L/B) ≥ 5, go to E.
* If (F)BB(V)+CV(L/B) ≤ 2, go to F.
* If (F)BB(V)+CV(L/B) = 4, 30% F, 70% E
*Else, random routing (50/50)

|D -> G, H = 
*Random routing if fleet contains any SS(V)
* If (F)BB(V)+CV(L/B) ≥ 5, go to H.
*Otherwise
**Meeting '''ANY''' of the following to '''FORCE''' G
***DD+DE ≤ 1
***Fleet contains any (F)BB(V) or CV(B/L) '''AND''' DD = 3
***Fleet contains any (F)BB(V) or CV(B/L), CL = 0 '''AND''' DD ≤ 3
***(F)BB(V)+CV(L/B) = 4
**Meeting '''ANY''' of the following to go to H
***Fleet contains no (F)BB(V) and CV(B/L)
***DD ≥ 4
***CA(V) ≥ 1 '''AND''' CL+CA(V) ≥ 3
*Random routing if not meeting any of the above conditions

|F/empty -> D = * Do not meet the requirements to go to H.
|F/empty -> H = 
* Meet '''ALL''' of the following requirements:
** No (F)BB(V) or CV(L/B)
**Meet '''one''' of the following 
***Amount of DD ≥ 4 and CL ≥ 1
***DD+DE = 6

|H -> I/empty, J = 
* Meeting '''ANY''' of the following '''FORCES''' you to I:
** (F)BB(V)+CV(L/B) ≥ 5
** Fleet contains SS(V)
* Go to J if amount of (F)BB(V)+CV(L/B) ≤ 1 '''AND''' DD ≥ 2
* Else, random routing.
}}

===Tips===
This map is mostly randomized on the path you take, with few notable exceptions that should be considered:
*Avoid bringing too many (F)BB(V) and CV(L).
*A well-balanced fleet is recommended for tackling this map.
*While dedicated ASW setups are not necessary, mixed ASW set-ups can be considered for DDs.

===Recommended Fleets===
<tabber>
|-|Medium Fleet=
*1CL, 2DD, 3AV/CLT/CA(V)
*1CL, 2DD, 2CA(V), 1BB(V)/CV(L) 
*Route = Random :
**{{MapRoute|A|red|B|green|D|red|H|red|J|red}}
**{{MapRoute|C|red|F|blue|D|red|H|red|J|red}}
**Will always fight 3 battles pre-boss but allow stronger ships that help withstand enemy shots compared to the light comp.
|-|Light Fleet=
*1CA(V), 1CL, 4DD
*Route = Random :
**{{MapRoute|A|red|B|green|D|red|H|red|J|red}}
**{{MapRoute|C|red|F|blue|H|red|J|red}}
**Cheapest composition, but requires high-level CL and DDs as they need to dodge the closing torpedo if they didn't disable all of the enemies CAs, CLs, and DDs in advance.
|-|Heavy Fleet=
*2CV(L), 1CLT, 3XX (XX can't be (F)BB(V) or CV(L))
*Route = Random :
**{{MapRoute|A|red|B|green|D|red|G|red|J|red}}
**{{MapRoute|C|red|F|blue|D|red|G|red|J|red}}
**Heaviest comp, with a slightly harder pre-boss, as you will always go to Node {{MapRoute|G|red}} where [[Battleship Ta-Class]] are awaiting, in exchange, you get to bring CV(L)s for opening airstrikes and more firepower on the way to the boss and at the boss node itself.
</tabber>

===Resource Nodes===
{{MapRoute|B|green}} is a "Normal Resource Node" rewarding fuel {{Fuel}}.
*''See [[Resource Node|here]] for more details.

{{Map/Footer|4-1|

|enemycompsnotes=

|shipdropnotes= 

}}