SOG not showing on FI-503 Digital Instrument

[swimmer56]

I cannot get the SOG to show on the digital instrument, It shows ok on the MDF12 but three dashes on the instrument. Depth shows on both but not SOG. I am using the GP-330B GPS receiver. Would like it to show both places like depth does, thanks!

 

[Johnny Electron]

Is the GP330B connected to the 2000 bus or is connected to the radar connection or via 0183 directly to the MFD?