Lowrance electronic X-4 Grayline®

Sensitivity set to manual mode (left). Sensitivity control bar (right).

To adjust sensitivity in Auto Mode:

1.Press MENU until the SENSITIVITY control bar appears. Press ↑ to increase the sensitivity, ↓ to decrease it.

2.Press PWR to clear the menu. If you reach the maximum or minimum sensitivity level, a tone will sound.

To turn on Manual mode:

1.Repeatedly press Menu to display the Sensitivity menu. Highlight MANUAL and press PWR to clear the menu.

Grayline®

Grayline→ helps you tell the difference between a hard and a soft bottom by coloring weaker sonar returns (soft, muddy or weedy bottom) with a narrow gray line or no gray line at all. A strong sonar return (hard bottom) will be displayed as a wide gray line.