@ivo Hey there!
It is not clear yet. I’m monitoring an area 2200ft AMSL and always get confused about the altitudes I select from the moving bar...
What exactly does “surface” mean in this particular case?
And if the elevation of the terrain in the surrounding area is 3000ft (therefore 5200ft AMSL) are we getting their respective “surface” data?
But most important, what does it mean if I choose 330ft or 2000ft charts in these particular examples?
Another similar question could be done when using flight levels...
Thanks in advance for the explanation!