No worries Howard, you just sounded frustrated, didn't sound like it needed an apology at all but thanks all the same.
Our NMEA 0183 information sheet, containing everything we are allowed to give away regarding NMEA 0183, has been linked to by eherlihy in this thread
(I can't link to it because of my commercial interests).
The thing with having to pay for standards is most people don't buy them so don't know what's in them.
I hope you have got everything sorted out now.