Please use the USB cable for configuring the A031.
This might be a stupid question but can’t you attach your Raymarine GPS to the Raymarine bus and then connect that to the Seatalk input of A031? Then A031 output to chart plotter? Sorry if it is silly I’m trying to imagine your setup.
I also don’t know if it would be relevant but we sell a gps unit call the QK-A012. This GPS unit is solely for gps and can connect via usb and wifi. Could this be helpful for your needs instead?
Please let us know how you get on.
Best regards