Under RIPA Rule 9, what restriction is placed on sports vessels of less than 20 meters in length and sailing vessels in narrow channels?

1. They are forbidden from entering any bay or port without a pilot on board
2. They may only navigate between sunrise and sunset
3. They have absolute right of way over large cargo ships and ferries
4. They shall not impede the passage of a vessel which can safely navigate only within a narrow channel or fairway