As Tokyo was the center of politics and Osaka was the center of economy, it was especially important to consider risk management in case foreign ships appeared in the sea near Edo and Osaka.
特に江戸は政治の中心地、大坂は経済の中心地であるから、江戸、大坂近海に外国船が来襲した際の危機管理の重要性が課題となる。