There may be different bylaws on the Whanganui river. Keep right is the general rule, so if heading downstream the boat or kayak should be on the true right, and on the true left if heading upstream. I don't know about the jet boat giving way to the kayak. Power gives way to sail (except in the Raglan harbour entrance, a bylaw because of the risk to boats from having to give way to windsurfers) but I don't recall anything about manually powered vs motor powered.
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