In addition to revision of the map, these envoys are believed to have been on the mission of confirming the travel routes to be taken by the daimyos and their retinues in the Sankinkotai that had already been in planning at that time.
彼らは地図の校訂を行うと同時に当時既に構想されていた参勤交代実施時の大名行列のルートを確認する意図があったとされている。