The Bong stick would be used by the crew in the canoe to signal to the submarine, who would pick up the sound by Asdic at up to 12 miles away and use it for tracking there location in order to pick them up.
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Richard
1943 Bedford QLD lorry - 1941 BSA WM20 m/cycle - 1943 Daimler Scout Car Mk2
Member of MVT, IMPS, MVG of NSW, KVE and AMVCS
KVE President & KVE News Editor
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