This ship is very large with good stabilisers - in the Med you should not feel a thing.
Just came back from a 5 day trip on the Navigator, we had quite choppy seas but movement was slight and none of our group of twelve suffered any illness! So don't worry and have a great time - we know you will.
Hi the ships are so large that most of the time you dont even realise youve left the port. the stabilisers as mentioned before do a brilliant job. have a great time.