Humminbird HELIX 9 Operation Manual page 50

Zoom in/Zoom Out
Use the Sonar Zoom View to see a magnified view of the bottom and structure. For example, if there are fish close to the bottom
or near structure (tree, vegetation, etc.), Sonar Zoom View makes it easier to see the separate sonar returns that might be displayed
close together.
Display the Sonar Zoom View
1. Press and hold the VIEW key.
2. Select Sonar > Sonar Zoom View.
Magnify Bottom Structure (Zoom In/Out)
1. Display the Sonar Zoom View On-Screen.
2. Zoom In: Press the +ZOOM key.
Zoom Out: Press the -Zoom key.
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. Zoom In: Press the +ZOOM key.
Zoom Out: Press the -Zoom key.
4. Close: Press the EXIT key.
Sonar (2D) 50