Lowrance HDS Live Operator's Manual page 77

When unselected, transducers connected to this unit cannot be
shared with other units connected on the network, nor can it see
other sources on the network that have this feature enabled.
For more information about how to setup Sonar, refer to the
separate HDS Live Installation manual.
Log sonar
Select to start and stop recording of Sonar data. For more
information, refer to "Start recording log data" on page 67.
This option is also available from the System Controls dialog.
View Sonar log
Used to view Sonar recordings. The log file is displayed as a paused
image, and you control the scrolling and display from the menu.
You can use the cursor on the image, measure distance, and set
view options as on a live Sonar image. If more than one channel was
recorded in the selected Sonar file, you can select which channel to
display.
You exit the view function by selecting the X in the upper right
corner or by pressing the X key.
Structure depth offset
Setting for Structure transducers.
All transducers measure water depth from the transducer to the
bottom. As a result, water depth readings do not account for the
distance from the transducer to the lowest point of the boat in the
water or from the transducer to the water surface.
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Sonar | HDS Live Operator Manual