Wiggins's thesis that identity statements require a sortal concept under which exactly one continuant qualifies entails that 'same ship' fails here, leaving the identity claim indeterminate rather than true.
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David Wiggins is a British philosopher who developed important theories about identity—how we determine what makes something the same thing over time, like what makes you still 'you' even though your body changes.
identity statement(Criterion for necessary truth)
A statement in which the predicate concept is contained within the subject concept, reducible to a form where both sides are equivalent
sortal concept(Discussion of what mental content is required to identify the referent of a demonstrative pronoun)
A concept that identifies an object by placing it under a kind or category (implied: more specific than a singular concept)