This is part 1 of the naval update, part 2 will come out later this month.
I would have waited to release it all in a single update, but some fixes were kinda urgent to release and could not wait 1 or 2 more weeks.

Part 2 is simply going to be a graphical update, so it can wait a bit longer :)

This update features a COMPLETE rebalance, from scratch, of all naval units in the game.
It would not have been possible without the HUGE help of @Chrys (that you may know through his work, such as his Napoleonic Wars mod, or American Revolution, WW1, and more).
He basically is responsible for 80% of the work that this rebalance demanded.

ADDED

• 12 new ships to Italy.
• 13 new ships to the UK.
• 8 new ships to Japan.
• 6 new ships to Germany.
• 14 new ships to the USA.
• 9 new ships to France.
• 2 new ships to the USSR.
• 1 new ship to Canada.
• 2 new ships to Fascist Spain.
• 1 new ship to Republican Spain.
• 5 new ships to Sweden.
• 1 new ship to Yugoslavia.
• 1 new ship to Norway.
• 7 new ships to Turkey.
• Max purchase for units is now shown in the store.
• Units having a sonar or a radar are now shown as small icons in the store.
• Possibility to change the configuration of a player mid-game (impacts ironman automatically). Human --> AI and AI --> Human. Cannot be done during a PBEM or real time multiplayer game. Only singleplayer.
• Bridges are now shown when you press the 'show all buildings' button.
• Carriers now have an anchor icon in the store.
  

CHANGED

• Multiplayer version is now 7.7.0.
• All of the game's ships stats.
• Ships cost calculation formula.
• Added +2 movement points to all planes.
• Supply ships now have 50 HP (vs 100).
• Convoys, Supply Ships, units in landing crafts can no longer capture victory points at sea (trade routes etc). AI behaviour has been updated accordingly.
• All prototypes now have a max fielded limit of 1.
• Reduced the cost of prototypes a little (to balance the fact that now they are limited to 1 fielded at a time).
• Reduced AI paratroopers purchase rate + more strict control when Historical Focus is ON.
• Weather, ZoC, Upkeep, Historical Focus must now all be ON to enable ironman mode.
• Editing a unit's name in the units editor will now trigger a refresh of its graphical representation.
• Several nations got a counter graphics update.
• Many current ships got renamed / a change of class.
• Landing crafts graphics have been updated.
• Reorganized the order in which stats are shown in the units editor.
• Improved AI units deployment routine. Should handle multi fronts better.
• Updated Russian localization.
• Rebalanced Europe 1939 standalone scenario.
  

FIXED

• Germany not going at war with USSR.
• Zooming in/out with the keyboard shortcut was way too fast.
• Campaign scenario Philippines North would set the wrong side when playing as the Allies.
• Players in lobby amount was wrong (it included people currently playing a MP game too).
• AI not moving some of its units in some cases (defensive ones).
• Issue when trying to join a faction in your native language.
• A nation not joining the proper faction when being declared war upon when the player declaring war has the same ideology.
• Terrain modifier value on the UI would not be shown when a unit was selected.
• Units having the 'radar' or 'supply depot' property would never retaliate.
  

REMOVED

• 1 Japanese ship.
• Turkish placeholder navy.
• 2 British ships
• 2 Soviet ships.
• 1 Spanish (Repubican) ship.
• 1 Portuguese ship.