AspEdit manual      Parallel function

In some cases airspace area boundaries are described as "along parallel XX".  This implies a loxodromic segment.  In most navigation applications, this causes a problem since they use orthodromic calculations.  For longer segments, the deviations can be considerable.  AspEdit solves this by inserting points along the parallel.  Every individual segment between the inserted points will be orthodromic, but the inserted points are selected such that the deviation between the exact loxodrome and the orthodromic segments will never be more than 100m.
See the Along parallel dialog box for further details.