Answer: It would be ocean's
Explanation: In this context the apostrophe show ownership, or WHOSE waters became choppy (I know an ocean is a WHAT and not a WHO but phrasing it like this in my mind always helped me). Without the apostrophe it would be the plural form of OCEAN.
Who is Soo-Lin bro, you need to provide more info for us to answer.
Answer:
Yes because they can give you a different view of things.
