Seaworthy implies the boat is safe to travel, not just functional.

Safety Focus

Professional judgment is often required to deem something seaworthy.

Technical Assessment

Seaworthy refers to the boat's condition, not size or type.

Condition Specific

 and over exploitation of the land resulted in a critical drop of the islands carrying capacity to make matters worse the loss of forests meant that people could no longer carve new canoes for deep-sea fishing as well without seaworthy vessels the excess population could not be sent off in

Terry Hunt and Carl...

 They abandoned the log boat base for a keel plank, and the boats became higher and more seaworthy. But these early ships retained the concept of the original log their strength depended on the outer shell of wood, not internal frames and beams.

What's so special about...

 who started shouting at them, hurling insults, throwing sticks, asking them to all disembark and get on this smaller, more unseaworthy boat. The parents were terrified for their children,