Humminbird HELIX 9 Operation Manual page 170

Adjust the Backlight
1. Press the POWER key.
2. Select Light.
3. Adjust the Backlight setting from Dim to 10 (brightest).
Restore System Defaults
Use the following instructions to reset ALL menu settings to the factory defaults.
CAUTION! Use this menu with caution!
1. Main Menu: Press the MENU key twice. Select the Setup tab.
2. Select Restore Defaults.
3. Press the RIGHT Cursor key.
4. Follow the on-screen prompts to confirm the reset.
Manage your Control Head 170