Lowrance
http://www.lowrance.com/Products/Marine/M68CSMap.asp
I have an older unit (M56) with shoot thru thull transducer. I have used it in the everglades and keys in fla. to the lakes and rivers of NY. Great unit with all the toys for a fidget A$$.
It will run off bateries and I keep a spare sleeve steup when on the water. Battery life is very good.
Wouldn't be on the water without it. I have the Hobie quest fisherman.
Philip
Excuse my spelling and grammar, I hooked Mondays and Fridays to either fish or hunt.