[CA] Simplify C120W System

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum OLMako20,

Please note that there are two issues with the Old System diagram:
1 - the Raystar 120 GPS Sensor is capable of supporting only SeaTalk or NMEA 0183 communications protocol. The Raystar 120 GPS Sensor does not support SeaTalkng communications. Accordingly, it may be interfaced to the system in one of the following manners:
----- interfaced to power and to the SeaTalk leads of the MFD's Power/NMEA 0183/Video Input Cable.
----- interfaced to power and the NMEA 0183 leads of the MFD's Power/NMEA 0183/Video Input Cable.
----- interfaced to the SeaTalk (yellow) socket of a SeaTalk to SeaTalkng Converter which is part of a powered and properly terminated SeaTalkng / NMEA 2000 backbone to which the MFD has been interfaced as a spur.

Should your external GPS Sensor be interfaced to a spur socket of a SeaTalkng 5-Way connector and should your MFD be receiving GPS data from the external GPS sensor (recommend verifying by configuring your MFD's internal GPS to OFF), then it is quite likely that the GPS sensor is a Raystar 130 GPS Sensor or a third party GPS sensor supporting NMEA 2000 communications. Accordingly, your simplified diagram will only work if the external GPS Sensor is a Raystar 130 GPS Sensor or a third party GPS sensor supporting NMEA 2000 communications.

2 - A powered and properly terminated SeaTalkng / NMEA 2000 backbone features only two termination plugs ... one in each of the system's two ending backbone sockets. Your backbone features four termination plugs

3 - SeaTalkng 5-Way Connectors and SeaTalk to SeaTalkng Converters are not designed to be interfaced to one another via a SeaTalkng Spur Cable. These SeaTalkng networking components are instead designed to be interfaced to one another via an appropriate length of SeaTalkng Backbone Cable.

Q1. My question is what is the preferred connection for the Raystar 120 since I will be eliminating the need for the Seatalk 1 to seatalk NG converter.
A1. See my response to Q1.

Q2. Can I run it as depicted?
A2. Not if the external GPS Sensor is a Raystar 125 GPS Sensor. The proposed solution may only be used if the external is a is a Raystar 130 GPS Sensor or a third party GPS sensor supporting NMEA 2000 communications ... see the response to Q1.

Q3. Can I eliminate it all together (5-way and 12V) and run the GPS antenna directly to the C120W Seatalk NG Port?
A3. Negative.