Get the Dual Beam...and you'll probably only use the 200kHz anyway. I only bass fish and don't see a point to having a dual or more beam unit on the trolling motor. Maybe if some of the walleye guys on here do things a little different they could chime in on this thread. I'd be interested to hear it.
I have always found that the 200kHz units worked so good there was never a reason to change frequency when on the trolling motor.
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