[lesuorac]

Which states are you referring to? Locally you need a certificate for motorized craft and it seems like almost every other state is in this situation.

You can get the certificate after taking training but I imagine there is some way to test out of it.

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The training doesn't need to be months long though. Try renting a jet-ski; they'll give you a very quick training but it's still present. Although jet-skis are probably not long enough to qualify as motorized boats in a lot of states.

https://www.americasboatingcourse.com/lawsbystate.cfm?lid=50

[adamsb6]

Thanks for the correction. My own state of Washington mandated boater education only about ten years ago, I assumed it was an early mover given how much navigable water we have.

[dzhiurgis]

Sweden and New Zealand doesn't require any licence to operate a boat which is great. But try leaving marina without any experience and your boat neighbour will stop ya or at least help you get your feet wet.