Though he had to ask the Bakufu for permission to survey various areas, the Bakufu not only granted him permission but also ordered domains throughout the country to cooperate with him because it determined that his operations were beneficial, perceiving a pressing need for a national coastal map in terms of national defense, with warships of the Western posers frequently witnessed in the sea of Japan.
各地の測量には幕府の許可を要したが、幕府も西洋列強の艦船が頻繁に日本近海に現れるようになったため国防上、全国沿岸地図の必要を痛感しており、伊能の事業を有益だと判断したため、測量許可のみならず、全国各藩にも協力させた。