My understanding would be that if the missed approach is defined as "track 030", it would have to mean from the MAP otherwise you could be tracking 030 from anywhere and thus not guaranteeing you obstacle clearance. The charts clearly show the missed approach track originating from the MAP. This is evidenced by comparing an NDB approach with the VOR approach at the same aerodrome. eg MEK. The MA track is depicted as originating from its respective aid. If you're not tracking from the aid it would normally give you a height to reach before the turn.
But if someone can clarify the BLN Sector A GPS arrival missed approach?? "Climb on track to 2400'. At 1000' turn as appropriate track 030 from BLN NDB" ??
