To set ILS or approach course values on our instruments, how can I learn exact values of the headings of the runways?
I mean, are the numbers correct when I use the F10 map ruler? Or should I add some exact values to these to match with my plane's instruments? I don't remember the name of this variation, magnetic deviation, declination? True heading, magnetic heading ?
What I want is, when I use my HSI, and follow it to the airport, I want to align with the runway perfectly during bad weather.
And is this same for all maps?