On Monday, May 23, 2016 at 9:26:08 PM UTC-4, AS wrote:
Has anyone out there ever used the Flarm-core's GPS-out signal
coming from the 9pin subD plug to pipe it into an SN10b?

Yes, hundreds of pilots use this combination...

If so, what kind of a connector did you use?

The 9 pin connector you mentioned above.

See instructions he
http://www.nadler.com/sn10/SN10_Resource_Index.html