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![]() ![]() This needed to be simple to use for dead reckoning navigation, not elaborate based on star shots and sidereal time using the siderograph featured above.īritish and American air forces held joint meetings regarding the design of the American A-11 watch, which in Britain was sourced for the RAF and labelled the 6B/159. One item which needed to be procured was a hacking watch for pilots to assist with accurate navigation. The RAF expansion schemes from 1934 to 1939 provided the opportunity for forward planning for the RAF and this was accelerated after the declaration of war in 1939.
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