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VanguardLH, 2025-01-13 22:39:I don't know if related or not, but years ago there was a system used to improve the accuracy of GPS, in places like harbours. They would put a special transmitter at a site. The exact location of the site was known, and also what error it got from the GPS system, continuously evaluated. A ship would use that information to correct their error from their own GPS receiver by comparison with the error on the site nearby. The resulting precision was maybe one meter.
Arno Welzel <usenet@arnowelzel.de> wrote:My reply was not "unfocused due to lack of information".
>VanguardLH, 2025-01-13 00:53:>
>Arno Welzel <usenet@arnowelzel.de> wrote:>
>VanguardLH, 2025-01-11 21:01:>
>
[...]Rather than nitpicking on the responses, just what is YOUR suggestion to>
Wieser regarding his statement of "a test with the GPS of a tablet I had
didn't give me much confidence in its accuracy"? Come on, now, give
some specific suggestions, so we can nitpick on your suggestions being
unfocused for a vague "test".
There is none. If a device is not accurate, you can't do anything about
it. A-GPS will not improve that.
*If*.
Yes - so what?
My reply was similarly unfocused due to lack of information.
Again: A-GPS is not improving accuracy. If GPS on a device is not
accurate, you can not improve that with software at all. There is no
"magic trick" to make the GPS reciever work more accurate and you also
can not "calibrate" GPS. A-GPS/A-GNSS only reduces the time to first
fix, since it will provide the satellite position data, so the reciever
does not have to download this data from the satellites using the slow
GPS downlink connection.
Also a magnetometer has *nothing* to do with GPS at all. It will only
report, to which direction the device is currently oriented. But this
has *nothing* to do with your current position. You may need to
calibrate a magnetometer from time to time.
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