Will the NGW-1 transmit data on its NMEA 0183 output that is received on the NMEA 0183 input?

This is unfortunately not possible.  Doing so would create a data loop which will quickly use up the narrow bandwidth available to NMEA 0183 devices and prevent vital data from being transmitted.

For more information on NMEA 0183 and how it works, please download our free guide to NMEA 0183 networking here: https://actisense.com/everything-to-know-about-nmea-0183-guide/
For more information on NMEA 2000 and how it works, please download our free guide to NMEA 2000 networking here: https://actisense.com/complete-guide-to-building-an-nmea-2000-network/