I recently purchased a boat mainly for fishing and it came with a hummingbird 798cI with sidescan. While at the coast and playing with the chartplotter I found the included chart has absolutely no detail, no bottom points, contours, nothing. I find if you want any real chart information you have to buy a navionics chip with your area. Anyone familiar with this? It seems like I have too choices, either buy the chip or purchase a used, small garmin, which I am very familiar with and have had really good luck with. Any opinions?