 While the ships were in drydock in July 1943 , Type 21 air search radar was installed on the roof of the 10 @-@ meter rangefinder at the top of the pagoda mast . In August 1944 , two Type 22 surface search radar units were installed on the pagoda mast and two Type 13 early warning radar units were fitted . Yamashiro mounted hers on the mainmast , while Fusō was the only Japanese battleship to mount radar on her funnel . 
