Final answer:
A sailing vessel is usually the stand on vessel when interacting with a power-driven vessel, except when the sailing vessel is unable to maintain course and speed due to wind conditions or when the sailing vessel is overtaking the power-driven vessel.
Step-by-step explanation:
In general, a sailing vessel is usually considered the stand-on vessel when interacting with a power-driven vessel. However, there are some exceptions to this rule. One exception is when the sailing vessel is unable to maintain course and speed due to the wind conditions.
For example, if the wind is blowing directly from the side (a condition called 'beam reach'), the sailing vessel may have difficulty maintaining course and may not be able to safely navigate around the power-driven vessel. In this case, the power-driven vessel would become the stand-on vessel.
Another exception is when the sailing vessel is overtaking the power-driven vessel. If the sailing vessel is actively moving faster than the power-driven vessel and is expected to pass it, the power-driven vessel would yield right of way and become the give-way vessel.