- Added Ship Commissions, allowing nations to buy ships from major powers
- Added new Module Slots to Submarines for AA/Deck Guns
- New Modules: 90mm Deck Gun, 203mm Deck Gun, Submarine Plane Hangar, as well as specialized Hydrophone and Radar Modules for Submarines

Added the Major Trade Port building
Rebalanced Ship Hulls to reduce Resource Need for later designs
Increased Submarines Detectability across the board
Rebalanced weapon modules so larger barrel/tube numbers don't double/triple/quadruple attack values anymore, meaning each barrel/tube more than 1 adds around 80% attack, not a full 100%
Added a Game Rule that allows free ship designs
Tweaked Blockade mechanic so that blockaded nations cannot trade anymore
Added blockade decisions for Finland, Sweden, Denmark, Norway, Spain, Portugal, Turkey and Greece

Fixed Starting Navies for Spain, Portugal, Greece and Turkey
Some bugs have been fixed

Version 1.21:

- Pocket Battleship Special Project that unlocks the Panzerschiff Hull
- Early Cruiser Technology unlocks the Coastal Defense Ship Hull as well
- Early Heavy Ship Technology unlocks the Pre-Dreadnought Hull as well

- Starting Navies for:
Netherlands
Norway
Sweden
Finland
Denmark

- Dockyard Production Output reduced from 5 to 4.7

- Similar to the other mods: Decisions have been added to gain a one-time bonus to specific researches

Version 1.2:
- Improved Compatibility across the board

- Dockyard cost reduced: 6400 -> 6000
- Dockyard output increased: 4 -> 5

- New Hull: Converted Fast BB
- Can be converted from Heavy Hull 2, 3 and 4
- Offers improved Speed and Aircraft Capacity
- Converted Battleship can now only be converted from Heavy Hull 1

- New Starting Navy system is in place, ships and ship designs are generated after the Game Start

- Hybrid and Super Heavy Carriers are now unlocked through Special Projects
- Doctrines have been rebalanced/reworked

- Minor Bug Fixes

- Fixed Game Crashing on declaring war

- Compatibility Patch for Hoi4 Version 1.15

v1.1 - Mahanian Doctrine:

- Added Blockade mechanic:
- When you have at least 5 Capital Ships in each of the relevant Sea Zones and your enemy is not able to deploy a response force, you can blockade them via decision.
- Being blockaded has significant negative impacts on the economy. If left unattended, it can decide a war of attrition.
- Breaking out of a blockade can be achieved by sending out a response force of at least 3 Capital Ships to one of the relevant Sea Zones.
- Territorial Expansion can in some cases allow you to bypass Blockades or at least make them harder to maintain.
- If you have Submarines, you can smuggle Resources and Goods, the latter of which reduces the penalty of being blockaded.
- List of blockadeable Countries currently: Germany, Italy, Britain, France, USA, Japan and the Soviet Union

- Higher Levels of Economic Mobilization increase Dockyard Output

- Convoy Losses now impact the military economy.
- Trade Laws have been reworked so trading (and therefore overseas trade) is more important.
- Overseas Troops require twice as many convoys to supply as before.
- Naval Supremacy requirement to launch Naval Invasions has been increased from 50% to 70%.

- Some Naval Doctrines have been nerfed
- Naval Doctrines now cost 50 Naval Exp
- Cost reductions for the three Vanilla Naval Doctrines have been applied to fitting Naval Doctrine branches:
Trade Interdiction reduces Fleet, Submarine, Cruiser and Convoy Warfare Doctrines
Fleet in Being reduces Fleet, Battleship, Cruiser and Destroyer Doctrines
Base Strike reduces Fleet, Carrier and Naval Air Doctrines

- The AI now is more likely to send their fleets on Convoy Raiding missions.
- AI countries now build more diversified designs.