navigation using true or magnetic
Hi
very simple question that I'm having trouble getting my head around.
With regards to navigation using true or magnetic north: On a commercial operation covering hundreds of miles would a GPS usually be set to navigate via true or magnetic N?
I would think that it would be True N as this would enable us to programme specific coordinates along lines of long and lat to form waypoints. But if this is the case then what role does magnetic N in navigation over long distances?
maybe i've got my head screwed on backwards about all of this, but any pointers would be appreciated.