Eagle Electronics 320 manual Grayline

There is a common exception to these rules of thumb. Some fishermen on freshwater lakes (or the ocean) using downriggers like to see them on the sonar. In many of those cases, you'll see a 50 kHz transducer frequency in use because the wider cone angle lets them watch the bait.

Sonar Features menu with a frequency of 200 kHz selected.

To change the frequency setting to 200 kHz:

1.From the Sonar Page, press MENU↓ to SONAR FEATURESENTENT.

2.Press EXITEXIT to clear the menu.

To change the frequency setting to 50 kHz:

1.From the Sonar Page, press MENU↓ to SONAR FEATURESENT.

2.Press ↓ to 50 KHZENT.

3.Press EXITEXIT to clear the menu.

Grayline

Grayline lets you distinguish between strong and weak echoes. It "paints" gray on targets that are stronger than a preset value. This allows you to tell the difference between a hard and soft bottom. For example, a soft, muddy or weedy bottom returns a weaker signal which is shown with a narrow or no gray line. A hard bottom returns a strong signal which causes a wide gray line.

If you have two signals of equal size, one with gray and the other without, then the target with gray is the stronger signal. This helps distinguish weeds from trees on the bottom, or fish from structure.

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