GPX routes into seatalk net??

[bhcva]

Has anyone figured out how to get gpx routes into the seatalk net? My configuration is a 620+ chartplotter and SL70 radar. The 620 uses the original cmap nt cartridges.

Last summer I was able to get 'next waypoint' onto my radar screen using seaclear or opencpn outputting nmea thru the raymarine nmea-seatalk converter. That no longer works, I think, due to a 620 malfunction??

Thanks for any suggestions.

Bruce