Map overlay documenting the activities of the US Naval operations, Japanese ships, and cargo ships from July 30, 1945. The overlay contains annotations regarding Japanese submarines I-121, I-147, I-158, I-161, I-162, I-202, I-353, I-367, I-373, I-400, I-401, HA-107, and HA-205, unknown type of ships Daisan Maru and Kaiyo, USS Peto (SS-265), US Okinawa, Task Forces 38, 39, and 93, Commander of Destroyer Squadron 25, US Radio in Guam, Commander of 7th Fleet, Commander of Submarines Pacific, and Commander of 3rd Fleet. 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, US Okinawa launching air strikes, Task Force 93 striking, Commander of Destroyer Squadron 25 preparing to conduct anti-shipping sweep and bombard, Task Force 39 sweeping area Juneau - July and August, Commander of 3rd Fleet sinking freighter transport carriers, IJN destroyers, luggers, and 3 barges, and damaging 2 cargo ships, 3 destroyer escorts, freighter transport carrier, 2 sea trucks, midgets, 6 luggers, light cruiser, and trawler, planes damaging I-202, USS Peto reporting life raft with 9 survivors, and Task Force 38 launching attack.