The information is not lost, it's compacted, so it's smaller and more difficult to read

 What slonezp stated !!

Looks like these guys have got you covered for most of your questions. I will chime in on the Lowrance vs Humminbird debate. They are both great units. I don't feel that there is a clear winner for either. Each has some qualities or features that are better than the others. It just boils down to which is more suited for you. One thing I will warn you about if you're going the Lowrance route, find out exactly what you want it to do and find out from a dealer or even on here exactly everything you need for it to work the way you want. They have a way of nickel and diming you for everything so factor that into your price and budget.