As Rob explained, there is a difference between "true" or "geographical" north 
and "magnetic" north. The world is on a slight elliptical path hence the 
magnetic north pole moves around a bit although I believe it is not moving like 
10 Km from one months to another. In any case, you would have to Google what 
the so-called "declination" is for where  you live to find out how much the 
true and magnetic north differ. The further north you live the more is the 
difference. Here where I live in northern British Columbia, Canada, the 
difference is about 22 degrees.

Best regards,
Sieghard

-----Original Message-----
From: 'RobH.' via VIPhone [mailto:viphone@googlegroups.com] 
Sent: Thursday, June 2, 2016 12:48 AM
To: viphone@googlegroups.com
Subject: Re: The Compass geo graphical north button

The only differences I know of are megnetic and "True" north,  with maybe 3deg 
or so difference.  3Deg or so on or off target might 
be important.   "Geographic" north might be a new name for "True" north,  the 
pole around which our planet rotates.

so the magnetic pole is off, but no idea on what longtitude.  So the difference 
on the compass would vary depending where you are in the world. E.g:  if you 
were on that longtitude, or itsopposite, then magnetic would indeed be true!
----- Original Message -----
From: "Terje Strømberg" <terjestrmb...@gmail.com>
To: <viphone@googlegroups.com>
Cc: "Terje Strømberg" <terjestrmb...@gmail.com>
Sent: Thursday, June 02, 2016 7:57 AM
Subject: The Compass geo graphical north button


Hi,

The Compass geo graphical north button in IOS 9. Settings, compass. What is the 
benefit of turning it on or off?

What is it, compared to normal compass north?

Take care

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