Originally Posted by
Velo Vol
I don't know how to change it, nor do I know what the actual should be. But 2800 versus 2300 is a pretty big margin of error.
I think that you have to do it on the desktop. Somewhere next to your elevation, there should be a little question mark. Clicking on it will bring up a dialog box with an option to correct the profile.
And yes - that's a pretty big difference, but I've seen worse. Some barometric altimeters are worse than others.