| Soroban (Abacus) | for long tabular computation. + - * / |
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| Slide Rule | for complex equation computation. accurate for 3 decimal places * / log exp trig(sin cos tan) roots |
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| Sextant | for accurate navigation. based on precision time keeping and accurate angular measurement. |
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| Chronometer (s) | for accurate time keeping. (3) three mechanical with manual wind (1) one or more solid state |
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| Hard Copy |
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| Communications |
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