Headings would be of no value to you ar all! As depicted on the chart shown, the sector identified with an MSA of 15,000 ft lies between QDM's of 180 and 270 degrees. (QDM being the magnetic bearing to the station, or fix being used as a reference point)
It makes sense now. Never got around thinking along the lines of the QDM. Ofcourse the premise is that we are heading to the station and within the selected bearings To the station the MSA is 15000 feet.
Intruder guess that's what you were trying to tell me...jst took a lil time to sink in. thanks