Map overlay documenting the activities of the US Naval operations, Japanese ships, and cargo ships from July 28, 1945. The overlay contains annotations regarding Japanese submarines I-147, I-158, I-162, I-353, I-367, I-400, and I-401, hospital ship Tachibana, IJN Radio in Guam, unknown type of ships Horai Maru, Shonan Maru, and Ko Fu 2 PC, transports number 137 and 172, subchaser number 49, coastal defense vessels number 38, 60, and 227, coastal defense vessel Miyake, Commander Submarine Squadron 11, heavy cruiser Izumo, cargo ship Hino Maru, USS Pipefish (SS-388/AGSS-388), US Okinawa, Task Forces 37, 38, 39, 93, Task Group 73.4, Commander of Submarines Pacific, Task Unit 34.8.1, US freighter SS Wild Hunter, Commander of 5th Air Force, Commander of 20th Air Force. Significant events visible on the map include IJN Radio in Guam reporting typhoon forming, I-147 and I-367 patrolling on line Marians and Okinawa, I-158 and I-353 patrolling area, Task Force 39 sweeping area Juneau - July and August, Commander of Submarines Pacific conducting anti-shipping sweep area, US planes attacking Horai Maru, US Okinawa launching air strikes, Task Force 93 striking, Task Unit 34.8.1 may bombard, carrying out Operation Tachibana, Task Force 38 launching attack on position/targets, Task Force 37 attacking, Izumo sinking by US aircraft, Hino Maru sinking by US submarines.