Re: Use the built-in GPS w/o OnStar? - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Use the built-in GPS w/o OnStar?
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Posted by John Davies (more from John Davies) on Mon, 16 Jul 2001 19:55:30 Share Post by Email
In Reply to: Re: Use the built-in GPS w/o OnStar?, Marc, Mon, 16 Jul 2001 13:38:40
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Marc is correct. How could the car transmit GPS coordinates to OnStar if it had no way of receiving the data from the satellites? Does not compute!!

GPS works by the ground unit locking onto and interrogating 3 or more satellites, receiving a 30 second (approx) data stream from each, then computing a 3 dimensional "fix" (usually - you can select not to compute altitude in many GPS units).

I believe the OnStar box only gathers the data, then shoots it off to the Home Office for processing. I might be wrong on this, because I have never read a detailed description of how the black box functions.

http://joe.mehaffey.com/ has all the info you might need on the subject of GPS. Check the Hyperlink below for a summary.

How Does GPS Work?

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