This is one of mine:
They creep in the shadows on the deck. The faint squelching sounds drowned out by the sounds of wind and wave. Closer they glide, leaving damp trails behind, like an arrow pointing to the heart of the ship.
The captian stared in fasciation at the compass needle's slow even counter-clockwise spin.
He felt a chill as he suddenly realized where ded reckoning said they were.
That chill masked the very real drop in temperature that oozed from the dark shapeless thing approaching his back...