Seaworthiness can be measured in terms of the vessel's:
1 Reserve buoyancy;
2 Freeboard;
3 Range of stability;
4 Dynamic stability;
5 Structural integrity* and
6 Seakeeping.
Ref: Daidola & Reyling, Marine Technology, SNAME, Nov. 1991.
Note: Structural integrity is added by yours truly MM.

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