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Teenage Mutant Ninja Turtles and Hello Kitty and friends are teaming up for the Ultimate Collab.

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Until the 2nd of February from 11am includes one pre-selected book or toy whilst it's last.

Hey everybody, welcome to the single tracks podcast. Today it's me, Aaron, and I will be hosting,

and I've got Jeff here, and we are going to talk to you about GPS. So what is GPS, and why should

we care as mountain bikers? So first off, let's start off with the history of the development of GPS.

This actually dates back to 1957 when Russia launched the first man-made satellite named Sputnik,

which you all probably have heard that name before.

And two American physicists at the time, William Geeyer and George Weifenbach, they were

monitoring Sputnik's radio transmission, and they realized that because of the Doppler effect,

they could calculate exactly where the satellite was in its orbit.

So this actually had implications going forward, and their boss tasked them essentially with

solving the reverse problem.

So instead of finding where a satellite was in its orbit, could you find a position on

Earth from a satellite in space?

So this led to the development of the transit system in 1959. And this was initially a

system of five satellites that was first used to find the position of the U.S. Navy's submarines

that were carrying nuclear missiles. So very important stuff here. And then the Navy eventually used that for their ships above water as well.

So the transit system was kind of limited. There were only five satellites in the system at the

beginning. So subs and ships could only get fixed on their position once an hour instead of with GPS.

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