Calculate cardinal points from GPS?

[f4lken]

Tomas Gustavsson wrote:
> Hello!
>
> First I would like to say that I'm a newbie when it comes to GPS, so
> please don't bash (or korn ;)) me if my thinking is rather stupid.
>
> I was thinking if was possible to calulate the cardinal points (N,E,S,W)
> by the difference (in longitude and latitude) between your current
> location and a fixed one. By doing so we should have our compass, at
> least in my mind ;).
>
> So what do you think guys? Is this even possible?
>
> P.S Hmm I think that I just understood that this isn't possible, at
> least not with just one fixed location as difference :/. Maybe it's
> possible with let's say 10 fixed coordinates as reference?
>
>
> Best regards
>
> /Tomas "tomplast"
>
>
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>   
I think that a GPS receive some information about cardinal point... So 
it will be more simple to read these information than calculate some 
difference... But, as I say, I'm not sure :(