Adrift (1993)

IN THE MIDDLE OF THE OCEAN, THERE ISN'T ANYWHERE TO HIDE

Katie and Guy take a sea cruise in their sailboat and discover a couple on a wrecked boat, victims of a brutal attack by their crew. They take Eliza and Nick on board. The new boarders appear nervous about returning to Honolulu, and when the boat's engines die and other little incidents occur, Katie and Guy start wondering whether the shipwrecked couple are what they appear to be.