Map overlay documenting the activities of the US Naval operations, Japanese ships, and cargo ships from July 20, 1945. The overlay contains annotations regarding Japanese submarines I-14, I-47, I-53, I-58, I-159, I-367, I-373, I-400, I-401, HA-202, and HA-205, hospital ship Hikawa Maru, coastal defense vessels Yashiro and Amakusa, coastal defense vessel number 60, IJN Radio in Guam, USS Threadfin (SS-410), Task Forces 37, 38, 39, 74, 92, and 95, Task Groups 30.8, 35.4, 73.4, and 73.4, Commander of the 3rd Fleet, Commander of the 7th Fleet, and Commander of the 20th Air Force. Significant events visible on the map include Commander of the 3rd Fleet ordering Task Force 37 and 38 to start heading to replenish, task group 35.4 heading to replenish, Commander of the 7th Fleet reporting IJN tug dead in water, task group 73.5 sinking 1 IJN subchaser, damaging 3 IJN sea trucks and 1 barge, task force 39 sweeping area Juneau - July and August, IJN Radio Guam predicting typhoon heading NE on 1944, USS Threadfin sinking IJN minesweeper #39, task force 74 reporting 200' IJN vessel exploding, task force 92 conducting anti-shipping sweep, and Commander of the 20th Air Force burning IJN ship sighted.