Nov 28, 2010 · The GPS is basically measuring your position repeatedly and measuring how far you move over a certain period of time and then dividing that distance by the time it's averaged over, and then that will give your speed. If you're stationary, the GPS will quite often give you a speed, so the GPS is not at all accurate in giving a speed when you're ...

Nov 27, 2010 · The GPS is basically measuring your position repeatedly and measuring how far you move over a certain period of time and then dividing that distance by the time it’s averaged over, and then that will give your speed. If you’re stationary, the GPS will quite often give you a speed, so the GPS is not at all accurate in giving a speed when you ...

Feb 11, 2025 · The speed of light is constant and a known figure. And that means that when the satellite transmits the signal to you, there's a particular time of flight for that signal to reach us. Your phone basically works out the time differences in the arrival times of all of these different signals from the different satellites.

Nov 27, 2010 · My GPS reports an average speed. Assuming I'm driving at a constant speed, is this a more accurate reflection of my car's velocity than the speedometer?

Jul 25, 2009 · According to Einstein if one object travels at greater speed than another object then time for the first object will progress slower. This is the basis of the ‘Twin Paradox’. Actually I never really understood this because, in space, who is to say which twin is travelling and which is stationary. Speed is a relative concept. Anyway...

Jun 6, 2013 · With a remote-control key-fob, a lorry driver can easily reduce the speed by 10%, by 20% or simulating a break such that the record is faked. One worry is that over time, as the technology for simulating these signals becomes simple and cheaper, the same thing will be happening with GPS based systems.

Oct 18, 2016 · For lower satellites, the speed factor dominates and the satellite clocks run slow, for higher satellites, the position in the field dominates and the clocks run fast. The dividing line is at an altitude which is equal to half the radius of the Earth. GPS satellites orbit below this altitude, so they run slower than a clock on the surface.

Feb 2, 2019 · I think so far I have not thought about it. I wear a fitness bracelet for several years. Sensors are built into smart bracelets, each of which registers a certain indicator. For example, calculating the speed, pulse rate and duration of physical activity, the gadget calculates calories expended or the duration of sleep.

Feb 11, 2025 · The speed of light is constant and a known figure. And that means that when the satellite transmits the signal to you, there's a particular time of flight for that signal to reach us. Your phone basically works out the time differences in the arrival times of all of these different signals from the different satellites.

Oct 18, 2016 · Stuart - It turns out that even though the differences are tiny, they're big enough to cause huge problems with the global positioning system, GPS. The constellation of GPS satellites that orbit the Earth each have their own clock on board, which broadcasts its signal to receivers, such as your smartphone.