Tag Archives: GPS

Repairing Sextants in the Age of GPS

I first arrived in New York harbor forty years ago, as a freshly minted naval architect working for Moore McCormack. In those days, the Brooklyn docks were crowded with US flag shipping companies, many with their headquarters or sales offices in … Continue reading

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Australia on the Move — Adjusting the Charts to Agree with GPS

Australia is, literally, on the move.  A year ago, we posted about how the Prime Meridian, the arbitrary line in Greenwich, UK, marking 0 degrees of longitude, had to be adjusted by slightly over 100 meters after the discrepancy was … Continue reading

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The Threat of GPS Hacking — Brush off Those Sextants

In 1998, the United States Naval Academy dropped celestial navigation from its curriculum. If a naval officer wished to know where he or she was, the officer simply had to read the display on a GPS (Global Positioning System) receiver. … Continue reading

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Why Did the Greenwich Meridian Shift?

Recently, it was reported that the Prime Meridian, as marked at the Royal Observatory in Greenwich, England, is off by 102 meters, over the length of an American football field. The Prime Meridian is the arbitrary line marking 0 degrees … Continue reading

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Update: Newport-to-Ensenada Racing Tragedy – Did the Aegean Hit the Rocks?

Initial speculation included an explosion and then a collision with a larger vessel.  Now an online GPS tracking system, SPOT, shows the yacht running onto the rocks on a far end of North Coronado Island at 1:36 a.m. Saturday.  The Coronado Islands are about … Continue reading

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