Navico Simrad I3005 Operator's Manual page 30

Use analog input to control backlight level
This option must be turned on if an external potentiometer is to be
used to control the backlight level.
Calibration data
Calibration data is used to calculate a value from the signal input
from the sensor.
Calibration data for the sensor being configured needs to be
obtained from the documentation following the device.
System Function ID (SFI)
A unique SFI must be assigned to each port that is to be part of the
LWE network.
If no SFI is entered (remaining with the default 0000 value), the
device will not be visible on the LWE network, and it will not share
any data.
NMEA 2000 message instance
The instance number is used to identify devices on the network. It
should only be required to change this if there are identical devices
on the network (e.g. port and starboard RPM).
NMEA 2000 installer notes
Used to identify a device in the NMEA 2000 device list.
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Software setup | I3005/I3007 Operator Manual