Assigned to the Second Fleet, Yamato was drydocked at Kure, Japan to receive upgrades. Two beam triple 6.1 inch (155-mm) turrets were to be removed and replaced by six (3x2) 5-inch (127-mm) HA AA mounts. Twenty-four (8x3) and 26 single 25mm AA mounts were to be added. Shelters were also added on the upper deck for the increased AA crews. Type 13 air search and Type 22 Mod 4 surface search/gunnery control radars were to be installed. The main mast was to be altered. Two 150-mm searchlights were to be removed (later installed ashore at Kure, Japan). Yamato was to be fitted with Type 2 infrared (IR) Identification Friend-or-Foe (IFF)/signaling devices mounted midway up on each side of the bridge; the system might had been based on the German Seehund IR device, built around a telescopic sensor that received light-waves in the IR range and registered a readout in the radio shack. The IFF system also included a pair of 20-mm binoculars coaxially mounted with the transmitting IR lamp on the bridge so that another ship could use the IR detector for elementary signaling or as a formation light for station keeping. About this time, Yamato was also fitted with multiple E27 radar detectors copied from the German FuMB 1 Metox R.600 Facility | Tabular Record of Movement
