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GPS: How the Global Positioning System Works
Bartosz Ciechanowski's interactive explainer on how GPS works — from trilateration fundamentals through satellite orbital design, pseudorandom codes, and relativistic clock corrections. One of the best pieces of technical writing on the web.
Bikesy: SF Bike Route Planner with Elevation
Bikesy was a San Francisco bike route planner that accounted for elevation — a key differentiator from Google Maps, which in 2012 didn't prioritize bike-friendly or flat routes. Ryan called it his new favorite website.