Ozexpat is 100% correct. If you dont have the published AZIMUTH navaid the whole DME-yark procedure goes tits up. In a case where the VOR is stuffed, its best you go with an alternative approach (usualy an overhead tear-drop from the NDB) that gets you on the LLZ. So youll be going for the Runway Whatnot NDB-ILS-LLZ procedure or similar.