The envoys were accompanied by their attendants to inspect and rate the state of political rule of the private lands (feudal domains) and kogi-goryo as 'excellent, fair, poor and bad,' as well as to survey the state of enforcement of shogunal laws, including the ban on Christianity, and the state of prices, market conditions, maritime shipping, ocean defense, etc., in each domain.
彼らは従者を連れて管轄する諸国の監察を行い、私領（諸藩）及び公儀御料の政治の実態を「美政・中美政・中悪政・悪政」などと格付けした他、キリスト教禁止令などの幕府法令の実施状況、領内の物価や相場、船舶や海防についてなどを調査した。