EV-100 and GPS data

[colbournee]

I connected my EV-100 to a third party HDS 7 chart plotted with a NMEA 2000 connector/wire spliced to a seatalkng spur cable. Wire colors were the same except for the yellow one which I did not use since the NMEA 2000 cable had no yellow wire. It appears to be working, I think. The chart plotter appears on the seatalknn network as Lowrance HDS-7 and I now get data from the chart plotter SOG, COG and depth reading on my P70Rs. However when I entered a track pattern on the P70 it gave an alarm 'no navigation data'. This was done at dockside, I have not done sea trials on it yet. Question- is there a way to verify if I am receiving position data from the chart plotter on the P70 (software v3.07). I went through all the data boxes on the P70 most navigation parameters were there for selection except the all important position data. I also went through the data sources P70 menu and selected HDS-7 for GPS data. I am assuming position data would be part of the NMEA 2000 data strings.