A sailboat under sail should never give way to a motor boat.
However, if it comes up against another sail boat:
1. Overtaking boats must give way
2. Those on Starboard tack have right of way
3. The boat that is closest to the wind (or on the windward side) should give way
Generally, vessels under sail power have the right of way.
If a powerboat is about to cross paths with a sailboat under sail give way, the sail boat is the stand-on vessel, therefore you are the give-way vessel and need to move accordingly.
A sailboat is typically considered the stand-on vessel relative to a powerboat when both vessels are approaching each other with the sailboat on a port tack, or when the powerboat is overtaking the sailboat. According to the "Rules of the Road," a sailboat under sail has the right of way over a powerboat that is under power. However, if the sailboat is not under sail and is using an engine, the powerboat may become the stand-on vessel. It's essential for both vessels to maintain a lookout and take action to avoid collisions.
mooring buoy?
only when under sail alone and is crossing path of powerboat
The sailboat is the give-way vessel when it is overtaken by the motorboat, which is generally considered the stand-on vessel. Additionally, when both vessels are on a collision course and the motorboat is to the right (starboard) of the sailboat, the sailboat must give way. In situations where both boats are under sail, the sailboat must also give way to a motorboat if the motorboat is not under command.
== There are too many variables to give a short answer, but generally speaking... a sailboat has the right of way over a powered recreational vessel when the sailboat is operating under the sail's power only. In other words, even if the sail is up, if the sailboat's engine is running and the propeller is engaged, it is considered a powered vessel.
only when under sail alone and crossing the path of the powerboat
Only when under sail alone and is crossing the path of the powerboat.
Only when under sail alone and is crossing the path of the powerboat.
only when under sail alone and is crossing path of powerboat
only when under sail alone and is crossing path of powerboat