[time-nuts] OT - GPS and North

Florian Teply usenet at teply.info
Sun Nov 22 07:50:16 UTC 2009


Am Saturday 21 November 2009 20:32:11 schrieb J. Forster:
> OK. Sme GPS receivers have magnetic sensors.  What do they do with/about
> magnetic deviation.
>
Just a wild guess: The GPS receiver also knows its location, and magnetic 
deviation is known to some degree in its variation over earth's surface. So, 
why not introduce a map of magnetic deviation that basically tells you: at 
location Lat; Long, your magnetic north points at 357 degrees instead of 360. 
Bingo, you're done. That would be especially useful in the pole region, where 
deviation becomes large, as the accuracy of magnetic sensors probably is in 
the order of a couple degrees.

Sounds reasonable, doesn't it?

HTH,
Florian




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