@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...
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What exactly does “surface” mean in this particular case?
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And if the elevation of the terrain in the surrounding area is 3000ft (therefore 5200ft AMSL) are we getting their respective “surface” data?
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But most important, what does it mean if I choose 330ft or 2000ft charts in these particular examples?
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Another similar question could be done when using flight levels...
Thanks in advance for the explanation!