N.H. Rev. Stat. Ann. § 12-G:48

Any pilot appointed by the authority, who has given security for the faithful discharge of his or her duties, may take charge of any vessel, except pleasure or fishing vessels, or a vessel of 150 gross tons and under, and shall pilot such vessel into and out of the river and harbor of the Piscataqua, first showing to the master thereof the pilot's appointment if requested.