Sound locator and searh light crews were also eligable for the award.

Sound locators deployed with the searchlights helped them find targets, later these were replaced with radar systems.

The US Army also used sound locators.

In late 1941 the battalion began to receive Radar-equipped 90-cm searchlight projectors to replace sound locators.

New 90 cm and 120 cm electric searchlights and their sound locators were linked directly to the guns to provide early warning.

Simon Stabler (sound locator)

The first major application of Blumlein's principles was in 1939, when he developed the visual display sound locator to help anti-aircraft gun-laying before radar was available.

The battalion had left its Coast Defense Group behind and exchanged the aircraft sound locators for SCR-268 radar sets.

Controlled by sound locators and radars, searchlights could track bombers, indicating targets to anti-aircraft guns and night fighters and dazzling crews.

The searchlights were sited in threes with a sound locator which, as its name implies, located the position of an aircraft by fixing on the sound of its engines.

The battalion was under the command of 41 (London) AA Brigade in 2 AA Division The equipment was modern 90-centimetre searchlights with early pattern sound locators.

As AA defence became more important, the school's name was changed to AA Searchlight and Sound Locator School, based at Ryde on the Isle of Wight.

Dixon was still at the controls and went through it in a series of dives and climbs coupled with forty-five degree turns to port and starboard, designed to confuse the sound locators and the gunners.

By the end of 1935 the small team at Orfordness had demonstrated not only that an aircraft could be detected by radar at distances well beyond the range of sound locators but also that its position could be measured in three dimensions.

In the absence of inland radar coverage, 1st AA Division's Chief Signals Officer, Lt-Col G.C. Wickens, devised a system of 14 fixed base-lines of sound locators to detect night raids approaching the IAZ.

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