Raymarine e7 User Reference page 301

Data sources menu
This menu enables you to select the external sensors and devices that will provide data to the display.
Auto / manual selection
Each dialog enables you to view and select your preferred data
source. selection of data source can be manual or set to automatic:
• Auto — the display will automatically select a device and attempt
to resolve any data conflicts that may occur where there is more
than one source of data for that particular data source (for
example, multiple GPS receivers).
• Manual — once the display has performed a search for connected
devices you can manually select the preferred device from the list.
Note: Selecting the Auto option may result in the system
choosing a source of data that you do not want to use.
Device selection
Menu item
GPS
GPS Datum
Time and Date
Heading
Depth
Speed
Wind
Customizing your display
Description
Enables you to search for any externally-connected GPS devices, and select the one you want
to use.
In order for your GPS receiver and multifunction display to correlate accurately with your paper
charts, they must be using the same datum. This option enables you to choose the data source
for this datum.
Enables you to select the device you want to use for the time and date information used by the
display.
Enables you to select the device you want to use for heading data.
Enables you to select the device you want to use for depth data.
Enables you to select the device you want to use for speed data.
Enables you to select the device you want to use for wind data.
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