The most basic graph for a serious crappie fisherman is a sonar and GPS. Even the basic models are very good. More serious fishermen willing to spend $700 or more will have the best units with many scanning and mapping options. Whether it’s a simple or complex unit, start by reading the manual.
I heard the groans when I mentioned reading the manual, but it’s an important step.
The next step is to head to the lake and leave the poles in the truck. Learn every function. Repeat using the functions in different depths. Whether you spend $150, $700, or $1700 on a unit it will only be as good as the user. -TH