He was latter appointed as member of the warship club and surveyed the Edo Bay. The following year, the Shogunate Ogasawara Islands Inspection Team (幕府小笠原諸島視察団, "Bakufu Ogasawarashotō shisatsu-dan"), led by Mizuno Tadanori, boarded the Kanrin Maru to preserve the area as Japanese territory. Gengo commanded the sailing ship "Senshū Maru" to surveyed the area. He boarded the ship with Arai Ikunosuke as a surveyor of the sailing ship. It was difficult to cross the Pacific Ocean in winter with an old sailing ship, and the Senshū Maru was washed away and had a hard time. Although it is very short, there is a memorandum of Gengo at that time. In 1863, Gengo was ordered to survey the Osaka Bay by engaging in two round-trip voyages between Edo and Osaka to escort the young shogun, Tokugawa Iemochi. In May of that year, he was summoned to the warship group, and it became more prestigious.