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Follow a guided path from first principles, or dive straight into any concept. Every lesson builds intuition before mathematics.

Guided paths

Learning Path
How Positioning Actually Works
Start with the geometry that turns distances into a location, discover what a receiver truly measures, learn why the sky's arrangement decides your accuracy, and finish by speaking the three languages every position is written in.
4 stepsAbout 70 minutes

All concepts

Coordinate Frames
Geodetic, ECEF, and ENU are three different languages for the exact same point. Knowing which one you're speaking — and how to translate — is the quiet backbone of all GNSS.
beginnercore
Dilution of Precision
The same measurements can give you a crisp fix or a mushy one depending purely on the geometry of the satellites overhead. DOP is the number that captures that difference.
beginnercore
Pseudorange
Why the ranges in satellite positioning are politely called "pseudo" — and how one humble, shared clock error turns clean geometry into a four-unknown puzzle.
beginnercore
Satellite Orbits
A GNSS satellite isn't hovering — it's falling, endlessly, and missing the Earth because it's moving sideways fast enough. Kepler's three laws turn that idea into the numbers that decide altitude, period, speed, and where a satellite will be when you need it.
intermediatecore
Trilateration
Finding where you are by measuring how far you are from several known points — the geometric heart of satellite positioning.
beginnercore