Thread reset:
The original poster has the subject title, "What local HD spot beat am I in". My answer is correct, as no one knows anything about transponder number assignments for the HD local channels on DirecTV.
The map that Questioner linked was derived from the actual FCC and ITC filings regarding DirecTV 4S, the first spot beam satellite DirecTV launched. This specific map was published in 2002 by Walter Morgan, in opposition to the DirecTV/Echostar merger. The data points included supposed power levels and the centerpoints of each beam. Therefore, some of the sizes of the spots on this map may be smaller than reality.
The map that dragon002 linked was derived from the user community. Users simply plugged in their readings for the six spot-transponders at 101, and the map was derived from those data points. This is definitely the DirecTV 4S satellite at 101 because the spot-transponders in question are 4, 12, 18, 20, 26 and 28. The DirecTV 7S satellite at 119 only uses 23, 25, 29 and 31 as spot-beam transponders.
So, to answer the original question posed by Questioner, there is no way to check the transponder mapping for the HD locals on DirecTV.
However, regarding the SD locals, here are your options in the New England area:
New York - transponder 20 and 12
Philadelphia - transponder 12 and 4
Boston - transponder 4 and 28
Washington, DC - transponder 18 and 26
Baltimore or Harrisburg - transponder 26
If you get a signal on any of those transponders, then you can get the local channels on those transponders.