When it comes to fighting crime, New Zealand police don't let transport issues get in their way.

They've got cars, motorbikes, a helicopter and even a tractor - now police will fight crime on the water on their new jet ski.

This Labour weekend, the Police Maritime Unit will use it to get closer to boaties and promote advice about the importance of staying safe on the water.

The use of the jet ski is about ensuring everyone is taking the necessary safety precautions, Inspector Dave Hines of the Police Maritime Unit said.

"It's really easy to make sure you stay safe on the water. It's all about being prepared, making sure you've done all the necessary checks on your boat and that you have the appropriate gear on board. That is lifejackets and reliable forms of communications equipment.

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"We also urge all boaties to ensure that you fully understand the 'road rules' of the water'.

NZ Police The jet ski will allow the officer operating it to get closer to boaties.

"So have a great weekend out there, be sensible and if you see our officer out on the jet ski then say hello, we will be doing our best to keep you safe on the water but need everyone to take responsibility."

This isn't the first time New Zealand police have unveiled an unexpected mode of transport.

In 2015, Waikato Police introduced a police tractor to help show the rural community "they matter".

Earlier this year Auckland police also became the first in New Zealand to use e-bikes for city patrols.