(Teacherjh) writes:

Can you tell me how much longer the long line is?

1571.43727838 1578.04946769 6.61218931502

It's under 7nm by my simple calculations. That sounds about right. It's possible
to diverge quite a bit from the GC path before racking up a lot of extra distance.
(That's why searching for good slightly-off-path fuel stops is so worthwhile.)

--kyler