GPS data obtained by the Mississippi Department of Marine Resources tracks the movements of the boat that carried Nolan Wells to Horn Island on July 4. The 18-year-old was found dead after going missing following an outing with friends on the island.

Your phone’s GPS works partly because Einstein was right about time. GPS satellites carry atomic clocks. Because they move quickly, relativity makes their clocks tick about 7 microseconds slower per day than clocks on Earth. But because they experience weaker gravity in orbit, their clocks tick about 45 microseconds faster. Net effect 38 microseconds per day. That sounds microscopic. It isn’t. Without correcting for it, GPS positioning errors would accumulate by roughly 10 kilometers per day. The remarkable part is what this says about systems built on measurement. A tiny error in something nobody notices can become enormous when repeated across a complex system. Markets have the same property. A timestamp slightly wrong. A price feed slightly delayed. A corporate action applied incorrectly. A tiny data error repeated millions of times. The individual error looks harmless. The system doesn’t care how small it was. Small errors become large when the system gives them enough time to compound. #Trading# #QuantFinance# #MarketData# #SystemsThinking#

I restomodded a 1995 GPS Time & Frequency Server, and learned wire wrapping, a little GPS history, and how to avoid the Telstra back-to-2006 bug. Video:

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Satellite phones and GPS devices: that is how 21st-century ‘refugees’ arrive in Europe. They are well-informed and equipped with all the necessary tools to report their location and be ‘rescued.’