Post History
The simple answer is to first draw the declination diagram (or at least picture it in your minds eye). Following is an edit of my answer over at GIS.SE: https://gis.stackexchange.com/questions/617...
Answer
The simple answer is to first draw the declination diagram (or at least picture it in your minds eye). Following is an edit of my answer over at GIS.SE: https://gis.stackexchange.com/questions/617...