There has been some confusion about the New Hampshire laws requiring a boater education certificate.  You should know that NH LAW specifies that a USPS certificate is all you need.  This could be a MEMBERSHIP certificate or a BOATING COURSE CERTIFICATE.

Here is the applicable law.

270-D:15 Certificate Not Required. – A person shall not be required to obtain a certificate of boating safety education if the person holds a certificate from any state indicating successful completion of boating safety education that meets or exceeds the requirements of this subdivision, a certificate from the United States Coast Guard Auxiliary, or a certificate from the United States Power Squadron.

Source. 2000, 52:3, eff. Jan. 1, 2002.