I just installed the 788ci on my pontoon boat and am very happy with the unit. This is my first fishfinder and I was afraid that it may be overly complicated. The screen is easy to read in bright light and I love the Fish ID feature. I am not that familiar with Lake Lanier and the GPS feature we let me explore. The unit powered up and worked without problems after installation. The 700 series is packed to the gills with professional technology, it has everything you need to find the fish. The unmatched 640V X 640H pixel clarity of the 5-inch diagonal screen provides unbelievable color and contrast. You'll see crystal-clear images of everything under the water, making it easier to root out the big hogs. Programmable preset buttons make switching between your favorite views a snap.