ARTICLE COMMENTS: How GPS Works

[Dave]

Please post any comments regarding the How GPS Works article here.

[BrianT]

Thanks for the article - I much enjoyed reading it. :-)

One thing: the link at the bottom to http://science.nasa.gov/Realtime/jtrack/3d/JTrack3d.html/ came up with a "page not found". Any chance of that being updated....?

Thanks again!

[Oldboy]

It probably should be http://science.nasa.gov/realtime/jtrack/3d/JTrack3D.html

Without the last "forward slash".
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Richard

TT 910 V7.903: Europe Map v1045
TT Via 135 App 12.075: Europe Map v1140

[johnbull]

Very informative many thanks

[mcrosser]

Very informative and time-saving!

[ivokiss]

Hello,
Thank you for making and maintaining such a good info resource.

In the introduction article How does the Global Positioning System work ?
http://www.pocketgpsworld.com/howgpsworks.php
Part The Satellite Network, third paragraph
"traveling at near 2,000mph" probably should be "20 000" mph ?

I'm new to satnav sphere but am interested and will learn. So your site is very helpful.
Thaks for your good work.

Ivo Kisselov
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ivokiss

[Darren]

Actually we're both wrong. A more accurate speed would be about 3.9km/s or a little over 8,000mph.

I've corrected the original article.
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Darren Griffin

[Javidkhan]

The Global Positioning System (GPS) is actually a constellation of 27 satellites orbiting the earth and five ground stations. Out of these 27 satellites 24 are in operation and 3 are meant for backup purpose (in case of failure).The ground stations are responsible for keeping the satellites in precise orbit. Each of these satellites weighs about 3,000 to 4,000 pound and they are placed 12,000 miles above us making two complete rotations in less than 24 hours.

Source: http://thesecretsofscience.com/technology/how-gps-works

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