A defensive position containing one or more artillery pieces or rocket launchers.
||A mobile radar unit used to provide local gun batteries with information on the range and height of aircraft and ships.
||A permanent site for fixed radar installations used as part of a National System for detecting the presence of aircraft or ships.
||A site in which one or more searchlights were positioned to locate enemy aircraft or surface vessels for the benefit of batteries and night fighter aircraft.
||An enclosed searchlight position, normally built of brick and concrete, and often roofed.