The 4" units are REALLY hard to see when out of non-glass water. If you want a sonar AND chart, I highly suggest waiting and getting into the 5"+ class of units.
I had one of the first Lowrance Elite 4 units and it was AWESOME, but I could barely see the damn thing in any adverse condition and I very quickly grew out of it.
I have a 7" unit now (giggidy) and will never look back...
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