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The first time I read about optical illusions like these as a kid was this Uncle Scrooge story referencing the Flying Dutchman:

In this case, being off the coast of Falmouth, the ship is more than likely standing still.

Especially if you can see big sails flapping or moving with the wind.

Or if it's got a hydrofoil. Those are also flying, just in water

It is more than likely not moving anywhere.