[GPSNavX]

MacENC can act as a NMEA data server. Clients such as iNavX can then receive the NMEA data. While iNavX and MacENC share similar functionality they are each separate applications which take advantage of their respective platforms. They each have their own set of charts, waypoints, routes, etc. Via X-Traverse they can exchange this data.

I can't speak for these iPad terminal apps, but it seems if one just wants to mirror a Mac screen that might be a better solution.