Ray60 not getting position data

I am hoping to get some help diagnosing the lack of position data getting to my new Ray60. I have a C80 Classic MFD so my interface is NMEA0183 direct from the C80 to the Ray60.

My connection is as follows:

C80 Out+ Yellow ----- VHF IN+ Yellow
C80 Out- Brown ----- VHF IN- Green

The C80 DSC output is set to NMEA 4800 baud rate and the VHF input is also set at Standard Speed.

Are there any additional settings in either the C80 or the Ray60 that I should try? Any other suggestions?

Thanks

Dave