Map overlay documenting the activities of the US Naval operations, Japanese ships, and cargo ships from May 21, 1945. The overlay contains annotations regarding Radio Guam, Commander Naval Pacific, Task Force 57, Commander Task Unit 50.5.6, Commander 5th Air Force, Commander 7th Fleet, Commander Task Group 73.4, Commander Philippine Sea Frontier, USS Redhead (AMS-34), Navy minesweeper Beemster (AMS 105), Field Requirement Unit Engineer Personnel, Japanese army Assault Unit No. 21, submarine HA-103, destroyer Harutsuki, transport ship Ono Maru No. 14, defense ship Daito Maru, merchant tanker Yoshitomo Maru No. 32, merchant ship Kinsen Maru, passenger cargo ship Kasado Maru, cargo ship Yumihara Maru No. 3, merchant cargo ship Eian Maru, hospital ship Hikawa Maru, submarine I-351, heavy cruiser Ashigara, cargo ship Tencho Maru, ship Faiain, ship Sumike, torpedo boat Kari, submarine chaser Shonan Maru No. 2, destroyer Hinoki Maru, minesweeper AMS No. 106, minesweeper AMS No. 36. Significant events visible on the map include the Shonan Maru No. 2 sighting a torpedo.