Skymods

Hearts of Iron IV Mods Catalogue

BetterNavyAI(LessBalanceChange)

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Author: HOI

Last revision: 4 Jul at 11:18 UTC

File size: 1.33 MB

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Description:
No Super USA Version

This version removes the additional USA factories, resources, and extra balance changes related to AI behavior from the existing mod.

This version is intended for players who want the improved naval AI behavior without making the United States excessively stronger.

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Maintained Balance Changes

  • Reduced late-game ship resource consumption
  • This is maintained because the AI quickly upgrades to late-game ship designs and produces more capital ships, but it cannot properly handle the increased resource consumption of late-game ships.
  • Increased ship range
  • This is maintained because the AI still does not properly move fleets beyond naval range limits.
  • Increased USA building slots
  • This is maintained because the AI builds more dockyards and needs additional space for later military factories.

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Mode for Navy Lovers

This mod focuses on improving naval warfare and AI fleet behavior.

This mod fixes issues where the AI avoids naval engagements, operates only small fleets, and keeps producing outdated ships.

The balance has also been adjusted so that the United States can maintain a historically strong navy.

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Balance Changes

USA

  • Increased building slots
  • Builds more dockyards
  • Produces more capital ships
  • Added Montana-class battleship design
  • If the war is prolonged and super-heavy battleship technology is available, the AI may produce the Montana-class battleship

United Kingdom

  • Produces more capital ships
  • Improved AI ship designs
  • Produces more convoys when needed
  • Actively conducts anti-submarine operations
  • Eliminates enemies that threaten its transport ships

Japan

  • Produces more capital ships
  • Improved AI ship designs

Germany

  • Produces more capital ships when it has enough dockyards
  • Focuses more on submarines if it loses most of its capital ships
  • Improved AI ship designs
  • Improved aircraft designs

General Navy Balance

  • Reduced larger navy fleet penalty per ship by 50%
  • Reduced ship resource costs
  • AI will split capital ships less often
  • AI will create larger task forces
  • Fixed an issue where ENG, USA, and JAPAN AI did not produce 1939/1943 versions of ships

General AI / Army / Aircraft

  • Improved AI armored division templates
  • Improved aircraft designs for GER, ENG, and USA

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Update 2025/11/25

Naval range and home port issue fixed.

In vanilla, there was an issue where USA ships could not properly travel between the Pacific and Atlantic Oceans because of naval range limitations.

This happened because the AI did not properly change its home port.

To solve this issue, the naval range of all ships except submarines has been adjusted to match the range of the latest ships.

Additional Changes

  • USA, ENG, and JAPAN will now prioritize sending patrol and strike task forces to nearby waters if hostile ships are detected close to their mainland
  • ENG will actively conduct anti-submarine operations and eliminate enemies threatening its transport ships
  • USA will protect ENG instead if ENG is judged to be no longer capable of protecting its own mainland

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Update 2025/12/14

Ship supply consumption has been significantly reduced.

Ship supply consumption has been reduced by 90%.

In the current supply system, if a fleet suffers from supply shortages, carrier-based aircraft lose organization and are unable to sortie.

Fleet supply is calculated based on the home port. However, the AI does not take this into account and often selects a nearby port in the operational area as its home port, even if that port has extremely poor supply capacity.

As a result, almost all AI fleets, except for small patrol groups, can remain in a constant state of supply shortage. Consequently, aircraft carriers are often unable to participate in combat.

This issue is especially noticeable for the United States, as it often fights near Japan while setting Pacific islands as home ports. This causes most of its carriers to become unable to engage in battles.

To address this problem, the supply consumption of ships has been greatly reduced.

This change resolves the issue where aircraft carriers fail to participate in combat due to fleet supply shortages.

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Update 2025/12/17

  • Fixed an issue where the AI did not properly upgrade naval bomber torpedoes

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Update 2026/02/20

  • Fixed crash issues in version 1.17.4
  • German AI now produces more submarines in historical scenarios

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Update 2026/07/04

  • Fixed issues in version 1.19.*
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