Trivia: Some of the other boats with pun names were "Luna Sea" (lunacy), "Keel-N-Time" (killing time), "Brain Waves", and "Swift Passage." Not only does swift passage mean quick, Jonathan Swift was the author of the original "Gulliver's Travels" book.
Trivia: In the film, Amanda Peet plays Darcy Silverman. Peet also starred in the movie "Saving Silverman" as Judith who was engaged to the character Darren Silverman. Jack Black (Gulliver) also starred in "Saving Silverman"
Answer: Obviously, it's just a deliberate error in a fantasy film that is full of plot-holes and errors. They certainly aren't anchor lines, as the ships are actively involved in a military engagement (surrounding Gulliver). Also, no navy flotilla of sailing ships would have lines hanging loose at the bow or stern, particularly going into a military engagement. Rather, the lines would be coiled and neatly stowed on deck. In this case, the deliberate error permits Gulliver to tow away the Blefuscudian ships in just a matter of moments (even though Blefuscu is over a half-mile away by water).
Charles Austin Miller