Eagle 250 df 用户手册

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To switch the Frequency, repeatedly press 

 until the Frequency

menu appears. Press 

↑ or ↓ to select the desired frequency. Press 

 to

clear the frequency menu from the screen.



The Fish I.D.

 feature displays — as fish — targets that meet certain

conditions. The microcomputer analyzes all echoes and eliminates sur-

face clutter, thermoclines and other undesirable signals.
The Fish I.D. feature displays symbols on the screen in place of the ac-

tual fish echoes. There are three symbol sizes: small, medium and

large. These show the relative size between targets. In other words, it

displays a small fish symbol when it thinks a target is a small fish, a

medium fish symbol on a larger target and so forth.
Fish I.D., the default setting for your unit, is an easier way for a sonar

novice to recognize a fish signal return when he sees it. But, locating
fish by symbol only does have some limitations.