I am trying to pass the course/exam, but all of the buoys being of the same colour (yellow, instead of red and green) and placed in a way that makes it extremely difficult if not impossible to know where the right track is, makes the exam far more difficult than it should be. It should be about navigating the narrow channel, not trying to solve the puzzle, of where the channel is supposed to be in the first place.
And no, the "arrows" are not helping.