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post #3 of Old 03-20-2011
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The "EB6" calculator from any pilot shop. That's a mechanical calculator, i.e. paper or plastic wheels on a card, that can give you a fast graphic solution, no power or internet access needed.

If there were no instructions with it, you can find them online. Weems & Plath sell a gen-you-whine nautical version, but they work the same way.
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