Mr V
In Oregon as of 2009 you are required to have a boating certificate just like NH to operate a powerboat. You can take it online and it also will be good in NH. Go to
www.boat-ed.com for more information on taking the course in Oregon. This way you don't waste one of your days.
There will be some who are going to say an on-line course is not valid in NH but as long as your state allows them online they are good here also.