Introduction - An overview of the article.

Where is He? - A description of how GPS helped rescue Captain Scott O’Grady from behind enemy lines in Serbia.

Time and Location, Precisely - Information about some applications of GPS.

It Started with Basic Research… - A description of the GPS satellite system and how it works.

A Tool to Study Nature - An early history of timekeeping, which is key to the GPS system.

Rabi’s Clock - The discovery of the basic physics that makes atomic clocks possible.

Practical Applications - The history of the development of atomic clocks from the 1940s until the 1990s.

GPS and the Future - Recent history of GPS and potential future applications.

This article is available in Japanese, and Spanish.