I always understand better with pictures

This is how I understand how this thingy works.

http://www.v1rotate.com/images/navmap.gif

basically draw 3 boxes and do all the calculations inside within these
boxes. This will limit the fixes to calculate.
Limit area #1 for your origin, area #2 for your destination (allow fixes to
be within these boxes so they can join to airways.)
Limit area #3 for route (Only vor's within airways)

KBWI
EMI
J211
JERES
J211
BUSTR
J211
LEONI
J211
JST
J152
AVERE
KPIT

jeres bustr and leoni could be dropped, since they are on same airways

KBWI
EMI
J211
JST
J152
AVERE
KPIT


Here is another link that might interest or help us within this project.
http://gis.vegcrew.net/cgi-bin/viewc....1&view=markup

Hank