Map overlay documenting the activities of the US Naval operations, Japanese ships, and cargo ships from July 29, 1945. The overlay contains annotations regarding Japanese submarines I-121, I-147, I-158, I-162, I-202, I-353, I-367, I-373, coastal defense vessels Uku and Kanju, coastal defense vessel number 60, destroyer Natsuzuki, unknown type of ships Harutsuki, Chuko Maru, Togo Maru, and Sazuahami Maru, USS Indianapolis (CA-35), Commander of 5th Air Force, Commander of the Pacific Ocean Areas, Task Forces 38 and 39, Commander of 20th Air Force. Significant events visible on the map include I-147 and I-367 patrolling on line Marianas and Okinawa, I-158 and I-353 patrolling area, Commander of Pacific Ocean Area reporting 12 Maru vessels under repair/construction, Task Force 39 sweeping area Juneau - July and August, Task Force 38 launching attack, and USS Indianapolis sinking from torpedo on July 30, 1945.