Raymarine DSM300 User Manual page 62

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Selecting Zoom automatically switches OFF Bottom Lock and A-Scope, if either of
these images were being displayed.
If you have split frequency selected, the selected Zoom image is displayed in both
frequency windows.
Notes: (1) The vertical Zoom Range Bar shows the range being displayed in the zoom
(left side) window.
(2) The size of this zoom range is determined by the zoom factor (2x, 4x or 6x).
(3) The position of the zoom range on the scrolling bottom (right side) window
is determined by whether you are using automatic or manual zoom mode.
AUTO positions the zoom range at the sea bottom.
In MANUAL, the range is positioned by moving the Zoom Position Line with
the trackpad.
DSM300 Operation with PLUS Series Displays