Good Afternoon,
Is the VHF outputting AIS data at 38400 baud rate and expecting to receive GPS data at 4800 baud rate?
If so then this could be your issue, the NGX-1 is only capable of outputting and receiving on a single baud rate. so either 4800 or 38400.
If the VHF has the ability to change the baud rate it receives GPS data on to 38400, then this should solve your issue.
If not, then I am afraid you will likely require an additional converter to handle the data on a separate baud rate.
Good Morning HakMat,
The NGT-1 is an NMEA 2000 to PC Gateway, The converter between NMEA 0183 and NMEA 2000 is the NGW-1, or the NGX-1.
I do hope that this has helped and if you do require additional support, Please raise a support ticket from the link below,