Just came home with the new unit! I also bought the Navionics map chip for the lakes in the South with 1 foot contours. Yesterday I spoke with a fella at the customer support at Navionics - really knew his stuff. He guided me through their website to look at different things. Like I said before, I like to find humps, ledges, etc. depending upon the time of year. CP, I am sure am glad you posted the link for the operation manual because what came with the unit is pretty pitiful. Thanks for your help, now I will start reading your sticky to learn more.

Question: My friend wants the same unit but has a Lowrance Mark 5 DSI and wants to swap out. Do they both use the same transducer, cable, and mount? Your replies are appreciated, thanks!