i have a castnet and i can generally find baitfish, but i have an old hummingbird wide 100 depthfinder that i don't have much faith in. i'm fixing to get a lowrance 520 with gps and i'm trying to save my pennies and get a hummingbird si unit. i think a better sonar unit will make a big difference for me. i've only had 2 sonar units and one was a bottomline and the wide 100 i have now.
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