[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
More information about the Time-nuts_lists.febo.com
mailing list