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You used to be able to buy a small box sextant from the chandlers that worked great but I haven't seen one for years. I think most navigators have forgotten how to navigate by the old ways since GPS took over.
You also need an accurate time to get the hour angle for longitude. This was the hardest thing to calculate for the ancient mariners but there are tables to find the time by the stars to take care of the time requirement.
Barry
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