Raymarine SPX 10 Installation Manual page 21

Chapter 2: System overviews
SeaTalk system with second autopilot controller
You may add a second controller to your system, which repeats autopilot information.
If you are using two control units, we recommend they are connected to separate
SeaTalk terminals on the SPX SmartPilot.
Primary
controller
SmartPilot
computer
SMARTPILOT
Secondary
controller
SeaTalk SeaTalk
instrument instrument
SeaTalk bus
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