Mr Manch said boaties speeding in congested areas was dangerous and could cause injuries to children, swimmers, divers and people in small craft. There was a 5 knot speed limit when you are near the shore, swimmers, divers and other boats.
"Each regional council will be letting boaties know in their communities that enforcement action will happen sometime during summer. The specific days when this action will occur will not be publicised. Our expectation is that safe boaties follow the requirements each and every time they go on the water.
"For Maritime NZ it is an important addition to the mix of education and promotional activities that we traditionally use to encourage safer boating."
Mr Manch said the intention was to deter those boaties who did not prioritise safety and chose to break the rules.
"Our aim is to reduce boating fatalities and injuries."
The trial, funded by Maritime NZ, will enable harbourmasters and their staff to get out on the water more often.