Humminbird ONIX Operating Manual page 210

Change the Engine Source Assignments
The instructions in this section are optional and allow you to change which engine is assigned as the Engine 1, Engine 2, or Engine
3 source in the control head.
1. Press the HOME key.
2. Select Settings.
3. Select Network.
4. Select Data Sources.
5. Under Engine Data, select Engine 1, Engine 2, or Engine 3.
6. Turn off Auto-Configure.
7. Select an Engine from the list.
NMEA 2000 Setup
Engine 1 Source Auto-Configured
Engine (1) is selected
210
When Auto-
Configure is
turned on, the
control head
assigns numbers
to each engine
automatically.
Instance 0 =
Engine 1 Source