Eagle FISHMARK 320 Installation And Operation Instructions Manual page 63

Grayline is adjustable. Experiment with your unit to find the Grayline
setting that's best for you.
To adjust the Grayline level:
1. From the Sonar Page, press
2. The Grayline Control Bar appears. Press ↓ to decrease Grayline;
press ↑ to increase Grayline.
3. When it's set at the desired level, press
MENU
Fig. 1A
Fig. 2A
|↓ to
G
RAYLINE
.
EXIT
Fig. 1B
Hard
structure
Fig. 2B
Hard
bottom
59
| .
ENT
Fish near
structure
Muddy
bottom
Grayline
Grayline