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Yes. But no where near as rough as in the North Atlantic Ocean, as the Baltic is not open ocean. The Baltic is mostly protected by land so the wind can not gather enough energy, in contrast to open oceans where it can.
Anyway modern ships have something called a gyroscope, which is a huge device placed in the middle of the ship, this is used to stabilize the ship in rough weather. This device insures that the ship does not tip over and to minimalise the boat rocking. You will only feel the same amount of rocking as you did in the Bay of Biscay.
When you first look at the sea it will look rough but it will not affect the ship at all, the officers of the ship know how to control the ship in extreme weather.
Source(s):
I am an aspiring cruise ship officer.
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- Many thanks for the answer and good luck with your career!