Hello, I keep facing this problem with the runways while tapping the airport from the Map, it indicates green but when approaching and contacting Unicom, the runways (Colors) options seems to be different from the ones shown on the map.
It does get confusing though since metar readings show heading (true) instead of the heading (mag) which I don’t know if there is a real good way of converting from one to the other.
I personally use these maps to find the magnetic declination for wherever I am; though often it doesn’t make too much of a difference when it comes to winds, maybe a few degrees difference.
Just a heads up for the maps that I posted above, in order to find the magnetic heading, you would have to add (said amount of degrees) for red, and subtract (said amount of degrees) for the blue areas. In the green areas, true heading is the same as magnetic heading.