There are few inventions that we rely on as much as the Global Positioning System, also known as GPS. But, when it was created in the late 1970s, nobody wanted it.

Prof Brad Parkinson and his team at the US Air Force built it, and the first GPS satellite was launched in 1978. However, GPS wasn’t widely used until an air disaster in 1983 highlighted the need for satellite navigation.

Nowadays, GPS helps countless people travel in the right direction. But, we also rely on it for many things you might not realise: it keeps aeroplanes in the sky, props up global trade, farming and construction, and even supports banking transactions.

Ben Henderson speaks to Prof Parkinson, "the father of GPS".

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by the past. We take you to the events that have shaped our world through the eyes of the people who were there. For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more.

Recent episodes explore everything from football in Brazil, the history of the ‘Indian Titanic’ and the invention of air fryers, to Public Enemy’s Fight The Power, subway art and the political crisis in Georgia. We look at the lives of some of the most famous leaders, artists, scientists and personalities in history, including: visionary architect Antoni Gaudi and the design of the Sagrada Familia; Michael Jordan and his bespoke Nike trainers; Princess Diana at the Taj Mahal; and Görel Hanser, manager of legendary Swedish pop band Abba on the influence they’ve had on the music industry. You can learn all about fascinating and surprising stories, such as the time an Iraqi journalist hurled his shoes at the President of the United States in protest of America’s occupation of Iraq; the creation of the Hollywood commercial that changed advertising forever; and the ascent of the first Aboriginal MP.

(Photo: GPS devices. Credit: George Wilhelm/Los Angeles Times via Getty Images)

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