[GPSNavX]

Yes you can output (repeat to a VHF or autopilot or ???) the NMEA from a GPS interfaced to a Mac using GPSNavX or MacENC. One could use this cable/adapter to achieve that..

http://www.gpsnavx.com/html/datacable.html


iNavX has the ability to be a client to a Mac (running MacENC) and use what ever NMEA data the Mac can provide for real-time data...

http://www.inavx.com/images/screenshots/...ntcpip.png

http://www.inavx.com/images/screenshots/...nchart.png

iNavX lets one use the most current and up to date charts available in both raster and vector formats. Furthermore only the charts that are desired need be downloaded. Once downloaded the charts can be used indefinitely.

I am sure in the coming months we will see exciting marine navigation applications giving the user many ways to use an iPhone and iPad aboard.