Thanks for your information. I can understand your SeaTrace is a class B ais receiver which outputs AIS data at 38.4kbps speed.

So what my suggests is as below,

1, Make sure the input port which you will connected to be 38400bps(setup and check via the configuration tool(you need windows computer and USB connection)).

2，Connect Tx A and Tx B to NMEA in+ and NMEA in – of A034 (if it doesn’t work please swap two wires).

3, Check if the input LED flash when valid AIS/GPS messages received.