Tier system is a system that judges the certain ship to have certain parts or traits to do certain tasks required for that tier. Normally it is impossible to upgrade a tier unless captain has upgraded its ship through the country power for example ( research breakthrough and etc), modified under the shipyard, risky situation like forcefully install a huge cannon on the ship

  Find this and other great novels on the author's preferred platform. Support original creators!

  Through other hidden methods and etc, it is possible to rank up the tier, After Tier 5, it may choose to change into other class

  Destroyer class

  Tier 0 Raft

  Tier 1 Sampan and Boats

  Tier 2 carvels, Carrack, Barge

  Tier 3 Junks, Galleon, Frigates, Triremes, Yachts, Man of wars

  Tier 4 Steamboat

  Tier 5 Steamboat with metal cover and lower hull base, ironclad