AIS on i70

I have GX2150 VHF with AIS receiver communicating to my a128 through NMEA at 38400 and all is fine on the a128. i see the targets etc. The issue is that I want to see it in the i70 AIS display. The a128 and i70 are connected through the seatalk ng network so I was assuming that data is available on the network. Any ideas how to get this data to display on the i70? When I look for transducers on i70 I just see the ITC-5 (depth, speed, wind).
thanks.