Map overlay documenting the activities of the US Naval operations, Japanese ships, and cargo ships from July 27, 1945. The overlay contains annotations regarding Japanese submarines I-13, I-147, I-158, I-156, I-162, I-353, I-367, I-400, and I-401, transports number 137 and 172, subchaser 49, coastal defense vessels number 38 and 60, aircraft carrier Hosho, destroyer Kaba, Commander of Submarine Squadron 11, unknown type of ships Banshu Maru, Notoro Maru, and Shonan Maru, United States Task Forces 38 and 39, Commander of 7th Fleet, Commander of Submarines Pacific, US Radio in Honolulu. Significant events visible on the map include Task Force 38 proceeding to refuel and launching point for Tokyo and Nagoya strike, I-147 and I-367 patrolling on line Marianas and Okinawa, I-158 and I-353 patrolling area, Task Force 39 sweeping area Juneau - July and August, Commander of 7th Fleet reporting IJN cargo ship and 3 luggers under construction, torpedo attacking Radio Honolulu, Commander of Submarines Pacific conducting anti-shipping sweep area, Task Force refueling and launching position to attack, and I-13 sinking on July 16, 1945.