Originally Posted by
skycowboy
yeah it was for practicing the DP... I haven't a friggin clue why that DP exist. My field is way out of the arrival and departure routing for BNA.
The DP exists to ensure that aircraft departing the airfield are clearing various obstacles around the airport, as noted on the bottom left of this page:
http://204.108.4.16/d-tpp/0705/00282TITAN.PDF
It has nothing else to do with route clearances or arrival/departure routes since those requirements are taken care of via vectors on course.