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Understanding How GPS Works

Holger von Jouanne-Diedrich walks us through the basics of global positioning:

Last week, I showed you a method of how to find the fastest path from A to B: Finding the Shortest Path with Dijkstra’s Algorithm. To make use of that, we need a method to determine our position at any point in time.

For that matter, many devices use the so-called Global Positioning System (GPS). If you want to understand how it works and do some simple calculations in R, read on!

Do read the whole thing; the explanation is laid out really well.