Not disagreeing ...but note the sailboat was had to tack because of the boundary of its navigable channel and did so before the powerboat was even its the picture. in fairness the sailboat also took evasive action by bearing away a little from its normal tack.
The powerboat was clearly seeing the port side of the sailing boat which, in my opinion, was entitled to hold its course in these circumstances.
Had there been a collision I suspect the powerboat would have been found to have been at fault.
No then.... BACK TO DRONES ..... lol