There was a thread on this a couple years back. I *think* it was "decided" that the FMC transposes you laterally onto the FAC and does not include any offset for a base or downwind. So, if you were on a base 5 miles from the threshold, 3 miles from the centerline, it would say you're at 4 miles. (3-4-5 triangle.)
Now I need to look that up again. That doesn't sound right, now that I think about it.
Last edited by ImbracableCrunk; 1st July 2012 at 19:09.