What pronoun is used to refer to boats and ships?

The correct pronouns that take the place of the plural noun "boats" or "ships" is they as a subject and them as an object in a sentence.

Example: The boats at the dock bobbed in the surf. They were painted many colors.

The pronoun that takes the place of the singular noun"boat" or "ship" is it as a subject or an object in a sentence.

Example: We watched the ship until it disappeared over the horizon.

In colloquial English, boats and ships are referred to as "she".

She is very seaworthy.

She saw many high waves in her time.