Tier system

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

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

Some appearance description normally ship girls have some ships parts around their body or they wore parts of the ships as their clothes.

This is some of the descriptions on those ship girls in the human form

Tier 1 ship: some of them have wood sticks on their shoulder and etc, have a dagger, sword, a spear as a weapon

Tier 2 ship: same as tier 1 but with the more advanced design of their clothes

Tier 3 ship: Same as tier 2 and some of them have mini cannons for firing

Tier 4 ship: Same as tier 3 but have a rod behind their behind, enable them to run much faster as the stream rushes out of the rod

Tier5 ship: Tier 4 but more armoured