Humminbird LCR 4x6 Operation Manual page 26

F. Zoom may be activated at any time. While learning to use Zoom it may be easier to press the
button to freeze the display after positioning the Zoom Cursor. This will give you time to study
the display. NOTE: If the display is stopped, the screen will not update (change) until the
button is pressed again.
G. Remember that because of the LCR's Total Screen Update, even while you are using Zoom,
no information is being lost. You can turn Zoom off, go to any depth range and see all the
information just as if you had been on that depth range all along.
THINGS TO KNOW ABOUT BOTTOM LOCK
A. When Bottom Lock is turned on, the screen will automatically split showing the full depth
scale information on the right and the expanded view from the bottom looking up on the left
(See Figure 23).