Humminbird Onix Opeartion Manual page 227

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.
Engine 1 Source Auto-Configured
Engine (1) is selected
227
When Auto-
Configure is
turned on, the
control head
assigns numbers
to each engine
automatically.
Instance 0 =
Engine 1 Source
NMEA 2000 Setup