Lowrance HDS-12m Gen2 Touch Operator's Manual page 81

Configuring data sources
Devices can be configured from the Data source menu or from the
device list. Select the device from the list and tap Configure.
Scope
You can select the Global or Local setting for display units and data
sources on the network.
Setting desired data sources to Global scope allows all display units
set to Global scope to use the same data sources.
Setting one display unit on the network to Local scope allows you
to select data sources independent of other global scope units on
the network.
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Networking | Lowrance HDS Gen2 Touch