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[i]The satellite hand computer, physically resembling a circular slide rule, is provided to aid the astronaut in solving navigation problems. The computer consists of three discs: a basic fixed disc, a small top fixed disc and a rotating intermediate disc. The computer is attached to the chart board for convenience and accessibility. The computer may be used to find orbital tangential velocity, orbital angle, drift, through ground speed, indicated ground speed and for multiplication, division and proportions.[/i]
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