ar ▁install ations , ▁command ▁and ▁control ▁areas ▁including ▁plot ting ▁room ▁data ▁coord ination , ▁machine ▁gun ▁emp lac ements , ▁anti - air craft ▁emp lac ements , ▁mort ars ▁emp lac ements ▁and ▁three - man ▁weapons ▁p its ; ▁ ▁R AN ▁sea wards ▁def ences ▁including ▁mine field ▁observation ▁systems , ▁anti - tor ped o ▁n ets , ▁hydro ph ones ▁and ▁tor ped o ▁tub es . ▁These ▁were , ▁in ▁general , ▁controlled ▁from ▁the ▁Port ▁War ▁Sign al ▁Station ▁situated ▁on ▁Nelson ▁Head ▁ ▁RA AF ▁rad ar ▁station ▁at ▁the ▁peak ▁of ▁the ▁Tom are e ▁Head land ▁reported ▁its ▁plots ▁of ▁aircraft ▁to ▁No . ▁ 2 ▁F ighter ▁S ector ▁in ▁New castle . ▁Any ▁necessary ▁commands ▁would ▁then ▁be ▁given ▁to ▁RA AF ▁Base ▁William town . ▁The ▁S ector ▁was ▁a ▁link ▁in ▁the ▁chain ▁providing ▁early ▁warning ▁of ▁enemy ▁approach . ▁ ▁The ▁RA AF ▁provided ▁an ▁ 1 1   k W , ▁ 4 1 5   V ▁electric ity ▁service ▁to ▁the ▁area ▁which ▁was ▁used ▁to ▁power ▁the ▁rot ating ▁anten na ▁and ▁this ▁was ▁transformed ▁for ▁the ▁use ▁of ▁the ▁other ▁services . ▁Most ▁listed ▁for tr ess ▁equipment ▁was ▁s ited ▁directly ▁on ▁Tom are e ▁Head land ▁except ▁the ▁head ▁battery ▁and ▁the ▁R AN ▁mine ▁and ▁loop ▁control ▁post ▁which ▁were ▁s ited ▁at ▁the ▁western ▁end ▁of ▁Sho al ▁Bay ▁Beach ▁and ▁on ▁Nelson ▁Head . ▁ ▁Tom are