1) Fitness 2) Fitness to traverse the seas 3) Soundness 
[law] Seaworthiness is a concept that runs through maritime law in at least four contractual relationships. In a marine insurance voyage policy, the assured warrants that the vessel is seaworthy. A carrier of goods by sea owes a duty to a shipper of cargo that the vessel is seaworthy at the start of the voyage. A shipowner warrants to a cha...
• (n.) The state or quality of being seaworthy, or able to resist the ordinary violence of wind and weather.
Sea'wor`thi·ness noun The state or quality of being seaworthy, or able to resist the ordinary violence of wind and weather. Kent. 
Statement on the condition of the vessel . It has valid certificates, is fully equipped and manned
[n] - fitness to traverse the seas
noun fitness to traverse the seas