Humminbird Onix Opeartion Manual page 224

Set NMEA 2000 Data Offsets
1. From the NMEA 2000 Sensor port menu, select Data Offsets.
2. Select a device.
3. Tap the on/off slider, or press the ENTER key, to turn it off.
4. Press and hold the slider, or press and hold the ENTER key, to set the offset amount.
NMEA 2000 Setup
NMEA 2000 Data Offset
224
Turn off the slider
to manually adjust
the data offset.