Final answer:
If a PWC is crossing within 150 feet behind another vessel, they must operate at a safe speed and maintain a safe following distance.
Step-by-step explanation:
If a PWC (Personal Watercraft) is crossing within 150 feet behind another vessel, they must operate at a safe speed and avoid creating a wake that may cause danger or damage to the other vessel. They should also remain in constant vigilance and be prepared to yield the right-of-way if necessary.
An example of how a PWC should drive in this situation is by reducing their speed, maintaining a safe following distance, and carefully observing the movements of the vessel in front of them to avoid any potential collision.