In 1861, after the opening of Japan to the world, when the British navy survey ship Acteon tried forcibly to survey the Japanese coast, ignoring the warning by the Bakufu that said it would not be wise to fuel the principle of excluding foreigners, the leader of the ship was much surprised to see a copy of the Ino's small map which the Bakufu officials happened to possess, and agreed to give up the survey project by getting a copy of the map from the Bakufu.
開国日本の開国後の文久元年（1861年）、イギリスイギリス海軍の測量艦アクテオン号(Actaeon)が、「攘夷論をあまり刺激しない方が良い」との幕府の勧告を無視して日本沿岸の測量を強行しようとした際、たまたま幕府役人が所有していた伊能小図の写しを見て、その優秀さに大いに驚き、測量計画を中止して幕府からその写しを入手することで引き下がったという。