Ok, now I have 3 posts in a row! Don't hate me
I figure I will pass the knowledge along to the next person who comes asking me.
It the center LON really the biggest variable that causes the calibration to get out of alignment? Assuming the calibration points are right on known map lat / lon coordinates, it seems to be the only thing that will cause the scale of the calibration to get out of alignment.
I just practiced on another chart - it seems the center airfields are right on and then as you get away from the center, they get more out of alignment - that sounds like a center longitude no being correct...I think..
Also, is the easiest way to check the overall calibration to go to the moving map area and look at...then go back to manage maps to adjust?