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#113204 - 10/06/03 09:13 AM sextant
Here's a URL to a good summary of navigation. The use of the sextant or its prececessors to determine latitude, essentially north-south position was comparatively easy, and had been in use for many years. But the determination of east-west position was far more difficult, depending at first on the ability to make a time-piece highly accurate for long periods of time and not affected by rocking of ship at sea.
Here's another fine article about navigation:
Of course now that we have Global Position Units of incredible accuracy, all the above is mostly obsolete.
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