GPS

Bartosz Ciechanowski's GPS explainer rebuilds satellite positioning from the ground up. It starts with landmarks and measured distances, then adds timing, clock error, three-dimensional geometry, orbital motion, relativity, atmospheric noise, and the coded radio signals a receiver must untangle.

What is GPS?

GPS begins with a figurine, a map, and the humble question of how distance can reveal location. That approachable setup grows one carefully justified layer at a time. Measuring tapes become signal travel times; circles become intersecting spheres; imperfect clocks introduce pseudoranges; satellites bring orbital geometry, atmospheric delay, navigation messages, and very faint radio broadcasts. Described interactive diagrams let readers adjust positions, timelines, offsets, and signal replicas as the machinery becomes more intricate. By the end, the blue dot in a phone map feels less like a convenience and more like a small miracle assembled from clocks, rockets, radio, mathematics, and patient error correction.

What you can do there

• Follow GPS from basic ranging to satellite signal decoding
• Manipulate diagrams for position, time, orbit, and radio-signal concepts

Why we picked it

The article refuses the usual leap from three circles to a finished answer. It keeps asking what breaks next, then uses another visual model to repair the idea. That rhythm makes an intimidating stack of physics and engineering feel like a chain of understandable problems rather than a wall of acronyms.

How to get the most from it

Set aside a proper reading session and move in order. Pause after each diagram to predict what a changed distance, clock bias, satellite position, or signal offset should do before adjusting it. The metric-imperial switch can keep the early examples in familiar units.

Good to know

This is a long technical read, and some demonstrations intentionally simplify real receiver behavior before later sections add complications. The article links a textbook and expert material for deeper study. Live controls, accessibility, motion, device support, and current performance were not verified during this check.

Who made it, and when?

Bartosz Ciechanowski is the credited creator or organization. The earliest supported launch date we found is January 18, 2022.