Apr 17, 2026
View on Steam↗HOI IV | Open Beta III
3/5 Moderate
BETAMajor naval overhaul reducing fuel consumption for heavy ships and carriers while reworking engine stats and submarine visibility.
Key Changes
- 1Screening Efficiency now scales with its actual value rather than being a binary check
- 2Massive reduction in fuel consumption for most Heavy Ship and Carrier hulls
- 3Submarine Nuclear Engines significantly buffed with -15% visibility and +20% speed
- 4Heavy Ship and Carrier engines now have significantly higher fuel consumption costs
- 5New 'Hit Profile' stat added to Ship Designer to show unmodified hit chances
- 6Submarine engines now provide passive visibility reductions
- 7Production costs for Cruiser and Heavy Ship engines reduced across all tiers
- 8Carrier Stance settings now apply predictably to the first 24 hours of combat
- 9Nuclear Submarines receive new bonuses from Long Range Submarine doctrines
- 10Support and Repair ships received increased Max Strength and operational range
All Changes
⚓Naval Balance(24)
- buffAdvanced Destroyers: Naval Dominance Factor increased from 40 to 42
- buffCoastal Defense Ship: Max Strength (HP) increased from 100 to 110
- buffEarly Heavy Ship Hull: Fuel Consumption reduced from 67 to 60
- buffBasic Heavy Ship Hull: Fuel Consumption reduced from 67 to 60
- buffImproved Heavy Ship Hull: Fuel Consumption reduced from 67 to 60
- buffAdvanced Heavy Ship Hull: Fuel Consumption reduced from 67 to 60
- buffEarly Heavy Ship: Naval Dominance Factor increased from 300 to 325
- buffModern Heavy Ship Hull: Fuel Consumption reduced from 80 to 72
- buffSuper Heavy Ship: Fuel Consumption reduced from 75 to 68
- buffConverted Battleship Hull: Fuel Consumption reduced from 87 to 70
- buffBasic Carrier Ship Hull: Fuel Consumption reduced from 87 to 70
- buffImproved Carrier Ship Hull: Fuel Consumption reduced from 87 to 70
- buffAdvanced Carrier Ship Hull: Fuel Consumption reduced from 87 to 70
- buffConverted Cruiser Ship Hull: Fuel Consumption reduced from 87 to 60
- buffEscort Carrier Ship Hull: Fuel Consumption reduced from 87 to 50
- buffModern Carrier Ship Hull: Fuel Consumption reduced from 90 to 72
- buffIce Carrier Ship Hull: Fuel Consumption reduced from 95 to 90
- buffImproved Carrier Ship Hull: Naval Dominance Factor increased from 300 to 325
- removeSupport Ships: Removed 1 Sub Detection and 1 Depth Charges
- removeImproved Support Ships: Removed 1 Sub Detection and 1 Depth Charges
- buffSupport Ship: Max Strength increased from 25 to 30 and Range increased from 3000 to 3500
- buffRepair Ship: Max Strength increased from 25 to 30 and Range increased from 3000 to 3500
- buffImproved Support Ship: Range increased from 4000 to 5000
- buffImproved Repair Ship: Range increased from 4000 to 5000
⚙️Ship Engines(21)
- buffLight Ship Engine III: Fuel Consumption lowered from 10 to 9
- buffSubmarine Ship Engine II: Now reduces Submarine Visibility by -3.5%
- buffSubmarine Ship Engine III: Submarine Visibility Reduction increased from -5% to -7% and Fuel Consumption reduced from 10 to 9
- buffSubmarine Ship Engine IV: Production Cost reduced from +20% to +17.5%
- buffSubmarine Nuclear Engine: Now reduces Submarine Visibility by -15% and increased Naval Speed from +10% to +20%
- buffCruiser Ship Engine I: Production Cost reduced from +15% to +12.5% and increased Naval Speed from +20% to +25%
- buffCruiser Ship Engine II: Production Cost reduced from +17.5% to +15%
- buffCruiser Ship Engine III: Production Cost reduced from +20% to +17.5%
- buffCruiser Ship Engine IV: Production Cost reduced from +22.5% to +20%
- buffHeavy Ship Engine I: Production Cost reduced from +17.5% to +12.5% and increased Naval Speed from +20% to +25%
- nerfHeavy Ship Engine I: Fuel Consumption increased from 20 to 22
- buffHeavy Ship Engine II: Production Cost reduced from +20% to +15%
- nerfHeavy Ship Engine II: Fuel Consumption increased from 25 to 28
- buffHeavy Ship Engine III: Production Cost reduced from +22.5% to +17.5%
- nerfHeavy Ship Engine III: Fuel Consumption increased from 30 to 34
- buffHeavy Ship Engine IV: Production Cost reduced from +25% to +20%
- nerfHeavy Ship Engine IV: Fuel Consumption increased from 35 to 40
- nerfCarrier Ship Engine I: Naval Speed reduced from +30% to +25% and Fuel Consumption increased from 12 to 16
- nerfCarrier Ship Engine II: Naval Speed reduced from +40% to +35% and Fuel Consumption increased from 16 to 24
- nerfCarrier Ship Engine III: Naval Speed reduced from +50% to +45% and Fuel Consumption increased from 20 to 32
- nerfCarrier Ship Engine IV: Naval Speed reduced from +60% to +55% and Fuel Consumption increased from 24 to 40
📜Naval Doctrines(5)
- removeCoastal Mine-laying 'Clearing Procedures': No longer applies bonus to mine sweeping to Submarines
- buffCoastal Mine-laying 'Clearing Procedures': Mine sweeping effect on Destroyers increased from +20% to +25%
- buffLong Range Submarines 'Ocean Patrols': Now also applies +10% bonus to surface detection for Nuclear Submarines
- buffLong Range Submarines 'Improved Dive Protocols': Now also reduces Surface Visibility of Nuclear Submarines by 5%
- buffLong Range Submarines 'Support the Surface': Now also applies +10% bonus to Torpedo Attack and Naval Speed for Nuclear Submarines
🐛Bug Fixes(2)
- fixScreening Efficiency: Screening Efficiency Effects are now applied based on the Efficiency Value instead of a binary check
- fixCarrier Stance Settings: Carrier Stance Settings now apply to the first 24 hours of Naval Combat consistently for all carriers
🖥️UI/UX(2)
- newShip Designer: Ship Designer and Ship Card now display Hit Profile stats for various attack types
- changeShip Card: Naval Minelaying and Minesweeping stats are hidden if their value is 0
Summary
Naval Balance Overhaul
This beta update focuses heavily on naval mechanics, specifically targeting fuel efficiency and engine performance. Most heavy ship and carrier hulls have seen significant reductions in fuel consumption, making large fleets more sustainable. Additionally, naval dominance factors for capital ships have been increased to better reflect their strategic value.
Engine & Submarine Rework
Ship engines have undergone a massive rebalancing. Submarine engines now provide visibility reductions, while cruiser and heavy ship engines are generally cheaper to produce. However, heavy ship and carrier engines now consume more fuel, creating a trade-off between hull efficiency and engine power. Nuclear submarines also received significant buffs through doctrine updates.
Combat Logic & UI
Critical fixes have been made to screening efficiency, which now scales with its value rather than being a binary check. The UI has been improved to show 'Hit Profile' stats in the Ship Designer, providing players with better data on how likely their ships are to be hit by various attack types.