when you scroll along the elevation profile a pop out window show the height. as a newbie im finding this a bit confusing. the above ground is self explanatory but the "above" which does I assume means sea level changes quite dramatically. ie flying across UTAH USA the above aground will say for instance 6000 feet with an above of only hundreds and as you move along the above will go into thousands . Can anybody explain this to me .  Thanks in advance

The above is related to the calculated flight profile.

https://www.littlenavmap.org/manuals/littlenavmap/release/latest/en/PROFILE.html#tooltip-label

Alex