Lowrance HDS-12m Gen2 Touch Operator's Manual page 97

Locking channels
You can lock selected SIRIUS channels from being broadcast unless
an unlock code is entered.
When the function is activated, a 4 digit code must be entered
before the locking is activated.
The same code must be entered before a locked channel can be
released.
Mixer
You can make adjustments to audio settings by tapping Mixer on
the audio options menu.
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Audio | Lowrance HDS Gen2 Touch