a. when the sailboat is crossing ahead from the starboard (right) side
b. when the sailboat is crossing ahead from the port (left) side
c. when the sailboat is overtaking the power-driven vessel
d. when the two vessels are moving in opposite directions
BrookeEnlightened
c. when the sailboat is overtaking the power-driven vessel
c. when the sailboat is overtaking the power-driven vessel
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