 When the 15 @-@ inch gun turrets were modernised , their existing 15 @-@ foot ( 4 @.@ 6 m ) rangefinders were replaced by 30 @-@ foot ( 9 @.@ 1 m ) ones in all turrets except for ' A ' and they were fitted for RPC in azimuth only . The turrets were also provided with de @-@ <unk> equipment and insulation to improve their habitability . 
