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== Supply Depots ==
Supply depots (aka "supply sources" or "supply centers"), are a physical location on the map where a
nation's supplies are automatically stored. All supplies created for the national stockpile are either stored in supply depots, in transit in the supply network, or are actively consumed by units. In this sense, the supply counter in the main screen toolbar is only an abstract aggregate: there is no single national stockpile. # Every country has a primary supply source located in its capital.
# The overseas supply source for any territory not connected to a nation's main land is a port.
Supplies are automatically distributed from the supply source to all core national provinces with IC.
== Supply Network ==
The game has one principle supply network method used for transporting supplies on land and overseas:
# All units draw supply by requesting it from the province they are located in.#
If a province cannot supply a local unit, it will request supply from an adjacent province :# # The first province asked will be the one located closest to the supply source. ## Every other adjacent province will be asked if a previously asked province cannot provide supply. ## If one adjacent province cannot meet the total supply need, multiple adjacent provinces may be used. ## Each province between the requestor and a supply source will carry the request for supplies forward, aggregating other supply requests as appropriate. ## Supply moves one province per day.
There are three ways for a player to manually manipulate the supply network:
# '''Transport planes:''' While transport planes are very expensive, carry limited supplies, and generally require air superiority, they can surgically augment areas with supply problems.
# '''Convoys:''' AI control of convoy creation and destruction can be turned off, allowing a player to manually create convoys.
# '''Supply re-route:''' Starting in Semper Fi, it is possible to create sea convoys to improve the supply flow to areas already connected via land to the supply depot (Lenningrad and Vladivostock: in addition to a land connection, can also have a sea connection). This can happen so long as the provinces involved are separated by at least 10 provinces.
* Brown shows province has a supply deficit: demand is higher than throughput. Effected by infrastructure level, terrain, or tech level.
* Red hatching shows limitation being imposed on the infrastructure.
* Red shows
demand draw is greater than required, province may or may not have supply , throughput is zero.
For more details, view this post [http://forum.paradoxplaza.com/forum/showthread.php?p=10011660#post10011660 by potski] on the HOI3 forums explaining the supply map and many intricacies and implications of supply draw.
=== Allies & Puppets ===
When units are in an allied nation, supplies will be drawn from the allied supply network. Meanwhile, an automatic and invisible trade route will be created between the two nations, where the exact amount of supplies and fuel will be sent from the nation with its troops abroad to the allied nation hosting those troops.
As a result of this system, supplies, fuel, or resources cannot be transferred through a puppet or ally. For example: consider that Japan is fighting near Beijing and has existing supply through north-eastern ports in China. Japan will not get supplied through Manchuoko by the Korean supply network. Note also that the "transit rights" agreement is only applicable to unit movement and stationing, and does not have a bearing on supplies.
There are several factors that limit the distribution of supplies:
# '''Supply Tax:''' Moving supplies costs a base tax of 0.1 supplies (decreased by Supply Transportation techs) per province moved through.
# '''Port Size:''' For overseas supply sources, the size of the port (each level equals 4 supplies) limits the amount of supplies that can be convoyed.
Air Base Size:''' Each level can support 4 supply units . Thus, a level 10 airbase can supply 40 air wings maximum.# ''' Partisan Activity:''' Partisans will disrupt your supply in any province with partisan activity, decreasing your supply throughput.
Supply Throughput can be improved through the following methods:
# Supply Transportation research reduces the supply tax per province.
# Laws can also affect supply throughput. Mixed Industry gives 5% bonus to throughput while Heavy Industry gives a 10% bonus to throughput.
# Less draconian occupation policies will decrease
partisan activity and improve supply throughput in occupied territory.
# The [[command structure|Army Group HQ]] will improve logistics by 5% based on each skill level of its commander.
# Building new infrastructure will increase the throughput of that province.
# Building IC in a core province without IC will create a new supply source and possibly improve nearby supply distribution.
=== Effect of Infrastructure ===