Navico Simrad I3005, Operator'S Manual

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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.
Calibration
Magnetic variation
Magnetic variation is the difference between true bearings and
magnetic bearings, caused by different locations of the Geographic
and the Magnetic north poles. Any local anomalies such as iron
deposits might also affect the magnetic bearings.
When set to Auto, the system automatically converts magnetic
north to true north. Select manual mode if you need to enter your
own local magnetic variation.
Network settings
Display sources
Used for selecting sources for this device if these are to be different
from the global NMEA 2000 sources.
The display sources can be either NMEA 2000, Lightweight Ethernet
or local sources.
By default, NMEA2000 global sources will be selected.
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Software setup | I3005/I3007 Operator Manual