Raymarine e7 User Reference page 197

Zoom split
With the zoom display mode you can split the screen and display
the zoomed image alongside the standard fishfinder image (ZOOM
SPLIT). The zoomed section is indicated on the standard fishfinder
screen by a zoom box.
Selecting zoom split screen
From the fishfinder application, with Zoom preset selected:
1. Select Menu.
2. Select Adjust Preset <mode>, where <mode> is the preset
already selected.
3. Select Display Mode.
4. Select Zoom so that Split is highlighted.
Selecting Zoom will switch between Split and Full.
Adjusting the fishfinder zoom factor
When the zoom function is active (Zoom Full or Zoom Split), you
can either select a predefined zoom factor or adjust it manually.
From the fishfinder application, with Zoom preset selected:
1. Select Menu.
Using the fishfinder
2. Select Adjust Preset <mode>, where <mode> is the preset
already selected.
3. Select Display Mode.
4. Select Zoom Factor.
5. Select a preset Zoom Factor (x2, x3, x4) or select Manual
Once selection is made you will be returned to the Display Mode
menu.
6. If Manual is chosen select Manual Zoom Factor
The manual zoom factor menu is displayed.
7. Select Manual Zoom Factor so that the zoom setting is
highlighted.
8. Using the Rotary Control change the zoom factor to the
required setting.
9. Press the Ok button, or select the Manual Zoom Factor menu
again to confirm the setting.
Adjusting the position of the fishfinder zoomed area
When the zoom function is selected, the system automatically
selects the zoom position so that the bottom details are always in the
lower half of the display. If required you can reposition the portion of
the image to be zoomed so that an alternative area is displayed.
From the fishfinder application, with Zoom preset selected:
1. Select Menu.
2. Select Adjust Preset <mode>, where <mode> is the preset
already selected.
3. Select Display Mode.
4. Select Zoom Position.
The manual zoom position menu is displayed.
5. Select Zoom Position .
Selecting the zoom position menu will switch the zoom position
between Auto and Manual.
6. If Manual is chosen use the Rotary Control to reposition the
zoomed area as required.
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