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The Glass, Bells and Watches

The Glass was a timing device which allowed sand to dribble through a hole at a precise pace; the ship’s bell was struck in half hourly intervals to mark the passage of time, allowing the watches to rotate.

GPS, Sextants and Astrolabes

Global Positioning Systems (GPS), used by most navigators today, began replacing the sextant on June 26, 1993. A system of satellites allows a receiver on the ground to calculate its position, expressed as a latitude and longitude, to within 30 feet.


Grog was a mixture of rum and water and was served to every man and boy in the Navy twice a day.

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