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version 1.6 date March 22nd, 2006:
22. Kuriles and Central Sakhalin removed from the game.
23. Supply/fuel generation added to Toyohara.
24. Five classes of Pre-WWI IJN TBs/DDs added.

(IJN Shirakumo)
25. CV Langley added (10/31/22).
26. IJN Aso/Tsugaru correctly start as MLs.
27. Minekaze-class IJN DDs correctly given 20 mines and reclassified as DMs.
28. AV Arostook had mines removed.
29. Maneuverability, durability, speed of cargo ships, troop carriers, and tankers adjusted to more realistic levels.
30. All english-sounding IJN ship names exchanged for Japanese ones.
31. USN BB, USN and IJN DD stats reworked using Conway's, Wikipedia, and other sources.
32. USN CA/CLs added.
Potential improvements in 1.7 depending on the outcome of 1.6:
- ASW upgrades for many IJN ships.
- Overhaul of mine warfare.
- Overhaul of aircraft available.
- Reorganization of IJA to have more than 2 non-restricted HQs.