The Bay of Plenty Regional Council want to remind locals it takes three to ski these summer holidays.
Any boat towing a skier, biscuit, wake board or similar device needs an observer.
The council said boatie behaviour on Tauranga Harbour had been good this summer, but Regional Council's patrols were finding that not having an observer when towing or skiing seemed to be the rule being broken within the Navigation Safety Bylaw.
Bay of Plenty Harbourmaster Peter Buell said the rule existed to ensure the driver was focused on looking ahead and scanning for hazards.
"With so many vessels, swimmers and hazards in the water its vital skippers keep their eyes ahead. If you are towing someone - be it on water skis or a biscuit or anything else - they must have an extra person on board to be a spotter. This includes jet skis."