The map shown below is an old, undated inspectors map of Ulleungdo that is on display at the Samcheok (三陟) Municipal Museum. It shows Ulleungdo with two neighboring islands labeled as "Big Udo" (大于島 - 대우도) and "Small Udo" (小于島), which represented Ulleungdo's neighboring islands of Jukdo (竹島 - 죽도) and Gwaneumdo (觀音島 - 관음도), respectively. It also lists, on the map, the titles and numbers of people who were part of the inspection team during that particular inspection. The leader of the inspection team was listed by his title, "Yeongjang" (營將).
From 1884 to 1888, a Korean official with the title of "Samcheok Yeongjang" (三陟營將 - 삼척영장) was charged with inspecting Ulleungdo. The fact that the map below lists the leader of the inspection team as "Yeongjang" (營將) and that it is, in fact, displayed in the "Samcheok" museum suggest the map was made sometime between 1884 and 1888.
Another reason I believe the map was made between 1884 and 1888 is that it showed and named Ulleungdo's two neighboring islands, which was done on only two other old Korean maps. One of the other maps was Inspector Lee Gyu-won's 1882 map of Ulleungdo. I believe that the map below was made after 1882 since it seems to have adopted Inspector Lee's new concept of viewing Gwaneumdo (觀音島 - 관음도) as an island rather than as a promontory.
The above map can be found on Tanaka Kinitaka's Web site at the following address: