Under RIPA Rule 18 (Responsibilities between vessels), what is the general priority rule between a power-driven vessel and a sailing vessel under sail alone?

1. The sailing vessel must always give way because the powerboat is faster
2. Both vessels must stop and wait for radio clearance from the Port Authority
3. The power-driven vessel is always the stand-on vessel in all encounters
4. The power-driven vessel must keep out of the way of the sailing vessel (unless the sailing vessel is overtaking the powerboat)