One fairly hefty Stena Line ferry at her moorings at Fishguard Harbour
... starts to move sideways...
...and then rotate...
...before straightening out...
....and heading off to sea
It's done with bow- and stern-thrusters, water-jets that add an astonishing amount of manoeuvrability to even a large-ish ship. It took about three minutes to spin the ship round.
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