Meaning of abbreviation 'S.I.' - Luftwaffe and Allied Air Forces Discussion Forum

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Meaning of abbreviation 'S.I.'

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11th February 2021, 18:09

Nick Beale Nick Beale is offline

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Meaning of abbreviation 'S.I.'

I'm looking at the ORB of No. 221 Squadron for 1942 (Wellngton anti-shipping ops from Egypt) and I've come across 'S.I. badly jammed'.

This seems to be referring to ASV radar but what does it stand for: search indicator, search instrument, special item or … ?

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