I think yes and no, so i put maybe. Here is why i WANT them:
1) If ye are looking for a ship for a quest, you could pop out that telescope and search the sea for it.
2) I like what hey 210 said, that you could see enemies on the ships. You could use a telescope to see where the ' special ' part of the ship is, such as the Captain's Quarters, AMMO HOLD ( full of gunpowder
), ect., ect.
Here is why we shouldn't:
1) If you took out a telescope, it would more than likely make you stop everything you are doing to look through it.
2) Telescopes would make the game very easy, making it so you could find ships you need without using the arrow.
I think i have talked enough, so thanks for listening!