Question 1:

I just installed new G4N units to replace my G3N units, and an Ulterra with built in MDI+

Helix 15 MSI+ G4N CHO up front.
Helix 12 MSI+ G4N at the console

MSI+ transducer at the transom.

I want to run the MDI+ and 2D for the Helix 15 off the Ulterra's built in transducer, but I don't see it as an option in the Network Source tab.

****************************
Question 2:

I'd like to take advantage of the G4N's built in NMEA capability.

I run a 2005 Johnson 140 4 stroke, same motor as a Suzuki DF 140.

I can see how to turn everything on in the menus, but I don't know how to connect to the motor.

I am digging through the manuals this evening, but any help is appreciated.

Never mind on the first - I had to change the transducer to "Built-in HW: MDI+ on the Sonar tab.

This is less than intuitive...

No ideas on the NMEA stuff?

You need to check to see what is required to add an NMEA interface to your motor.  It may not be an option.  I know my Merc requires a $400 NMEA 2000 Gateway.    Also there are two NMEA standards NMEA 0183 and the newer NMEA 2000.  The motor and fish finder need to be using the same standard for it to work.

19 hours ago, Tennessee Boy said:

You need to check to see what is required to add an NMEA interface to your motor.  It may not be an option.  I know my Merc requires a $400 NMEA 2000 Gateway.    Also there are two NMEA standards NMEA 0183 and the newer NMEA 2000.  The motor and fish finder need to be using the same standard for it to work.

Thanks...do you have an idea how to start down that path?

I've run a few searches and can't find anything definitive.

1 hour ago, Further North said:

Thanks...do you have an idea how to start down that path?

I've run s afew searches and can't find anything definitive.

No I don’t.  Sorry