bass, **IN THE CONTEXT** given, the difference in distance over 120 nm is about
0.000872225 miles, or a little over 3 feet.

Oh, I totally understand the differences between planar and spherical
mathematics. I also understand that you are foolish if you think that,
when measuring distances across the earth's surface, there is
absolutely no way that planar math will give you the correct distance.
No more that than in ANY circle. The chord length will ALWAYS be
shorter than the arc length of the same segment. Do you disagree with
this statement? If so, how?