(b) an authorised person appointed under Part 2 by an authority (within the meaning of Part 2) has reasonable grounds for believing that a personal watercraft or recreational craft (within the meaning of Part 2), is unseaworthy and is going out to sea or in waters or is being sailed or operated in Irish waters and he or she considers that the vessel is liable to founder or be unsafe for persons on board or other users of Irish waters, he or she may seize (using reasonable force, if necessary) and detain the vessel in the interest of safety of persons, until such time as the vessel is made to his or her satisfaction seaworthy.