Map overlay documenting the activities of the US Naval operations, Japanese ships, and cargo ships from July 25, 1945. The overlay contains annotations regarding Japanese submarines I-13, I-58, I-147, I-162, I-353, I-367, I-400, and I-401, aircraft carrier Hosho, coastal defense vessel Oki, unknown type of ships Shinei Maru, Kaiyo, and Chokai Maru, USS Angler (SS-240), USS Maurice J. Manuel (DE-351), Task Forces 39, 38, 93, and 95, Commander Fleet of Air Wing 617, Task Group 73.1, Commander of the 5th Air Force, Commander of the Pacific Ocean Area, Task Units 17.1.3 and 32.12.4, and Commander of Submarines Pacific. Significant events visible on the map include I-147 and I-367 patrolling on line Marianas and Okinawa, I-58 and I-353 patrolling, Manuel (DE-351) dropping depth charges on possible sub, Task Force 39 sweeping area Juneau - July and August, Commander of the 5th Air Force damaging 3 IJN freighter transports and burning a sea truck, Kaiyo sinking from aircraft after hitting a mine, torpedo planes attacking Chookari Maru, USS Angler missing unidentified ship with 3 torpedoes, Task Unit 17.1.3 sinking IJN tugboat, Task Force 38 launching attack, Task Force 38 proceeding to refuel after attacking, Commander of Submarines Pacific conducting anti-shipping sweep, Task Unit 32.12.4 hunting the submarine that attacked US destroyer escort USS Underhill, and I-13 sinking on July 16, 1945.