In modern English, the term ghost ship has come to denote at least one of three separate (though
occasionally overlapping) definitions, all of which involving, in one respect or other, unexplained
circumstances. Historically, the term has been used to refer to reported sightings of apparitions over
water that have appeared in the form of maritime sailing ships, often after having previously been known
to have sunk, or to derelict vessels found floating with no crew. In fiction, ghost ships have often been
vessels crewed by some manner of spectral or non-living beings.