When there is more than one device of the same type (like a GPS) on the NMEA 2000 network, the NGW-1 will use the data from the highest priority (lowest source address). If the device you'd rather use as a secondary Talker for the NGW-1 claims a lower source address then unfortunately there is no easy way to change this. The first step would be to try changing the device..
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NMEA 0183 Output. It is perfectly acceptable to connect up to eight devices to the NGW-1 NMEA 0183 output provided that they are all individually electrically isolated, depending on the electrical demands from each device. However, please check with your device manufacturers that you do not have more than one device that does not have an electrically isolated input...
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The only NMEA 0183 sentence that is currently used for engine data is RPM, so it is impossible for any manufacturer to create a conversion from NMEA 2000 to NMEA 0183 for all of your engine data...
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