By shallow, in the drought we're experiencing, I saw 9' at the deepest part of the channel in the river up to inches along the shore.

My naivety on the term Combo. I thought they were ones that had different sonar ability. Down,side, um all the other ones. Lol

I haven't bought any yet. I'm waiting on the iLink Minn Kota troller and will be trying to pick the best, for me, fish finder. I will probably fish the river I live by the majority, the Kankakee. But there are many lakes close by also.

Thanks for both your responses.