I am not too sure how to use the wind direction/speed at different altitudes. Say for instance you take a location that is 5000' amsl and use the cursor to move the height to 6400 feet....does it mean that the altitude is 6400 feet above the 5000' elevation or does it mean 6400 feet amsl, in other words 1400 feet above ground (the 5000' location)?

I am not too sure how to use the wind direction/speed at different altitudes. Say for instance you take a location that is 5000' amsl and use the cursor to move the height to 6400 feet....does it mean that the altitude is 6400 feet above the 5000' elevation or does it mean 6400 feet amsl, in other words 1400 feet above ground (the 5000' location)?