Simrad AP28 Operator's Manual page 58

Automatic source update
The Auto select function is mainly for situations where
the automatic source selection needs to be updated
because a selected data source is not supplying data or
has been physically replaced with another one. The
update secures that the existing source selections are
valid and maintained. Missing sources are either
automatically exchanged with an alternative source from
the list of available sources for the given data type or the
replacing source is selected. If a source is no longer
available for the given data type, the display will show
'- - -' instead of the source acronym.
If more than one source is found for each data type, the
preferred source may be manually selected.
Manual source selection
Data sources can also be selected manually. All devices
providing data of the given type will be listed in a device
list. Highlight the data type and press the key to
display the list of available devices.
Confirm selection of the highlighted device.
Exit without selecting
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