The third one is true north on the axis of rotation.

Geomagnetic is not true north.

"Capt. JG" wrote in message
...
Geo I believe is the true north on the axis. Magnetic is where the compass
points. The latter is moving toward somewhere in Russia. I believe there's
a third also. Care to name it?

--
"j" ganz @@
www.sailnow.com

"Bob Crantz" wrote in message
...
What are they?

What's the difference?

Which one is real ?

Extra credit:
Why aren't they the same?