Stan Gosnell wrote:


But in this case, GPS is not being used as a sole source of navigation, just
for one part of one approach. Using the sole source logic, no GPS approach
would be legal.


Not exactly. The approach and departure phase of flight was approved for sole
source terminal operations pending implementation of WAAS. But, sole source en
route operations have yet to be approved. When you miss and go to the VOR you
are returning to the en route structure.