Article: Frequency matters.(Electronic Fisherman)

The early days of LCD fishfinder technology saw computers being added to sonar units. Today's fishfinders, in contrast, look more like computers with sonar thrown in. Now, upgrading your electronics and being happy with the results means correctly executing a list of technical choices. These include color or monochrome; big or small screen; portrait or landscape screen orientation; pixel count; transmitter power; and operating frequency (a choice with several ways for you to screw up).

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Models now come ready to operate on one, two, three or four operating frequencies. Understanding what that means helps you make an informed choice. ...

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