Humminbird HELIX Series Operation Manual page 71

Zoom In/Zoom Out using the X-Press Menu
If your control head does not include ZOOM keys, you will use the Zoom Level menu to use the ZOOM feature.
Magnify Bottom Structure (Zoom In/Out)
1. Display the Sonar Zoom View on-screen.
2. Press the MENU key once.
3. Select Zoom Level.
4. Press the RIGHT or LEFT Cursor keys to adjust the setting.
Magnify the Cursor Position (Zoom In/Out)
1. Display the Sonar Zoom View on-screen.
2. Use the Cursor Control key to move the cursor to a position on the view.
3. Press the MENU key once.
4. Select Zoom Level.
5. Press the RIGHT or LEFT Cursor keys to adjust the setting.
6. Close: Press the EXIT key.
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Sonar (2D)