I recently purchased a used HUMMINBIRD 398CI HD SI to go on my 19DLX CAROLINA SKIFF(tired of having 2 units, wanted 1 to reduce clutter, and found a good deal on a side imaging one). I haven't been able to find much detail on what exactly comes on each card as far as fresh VS salt coverage goes. I only have plans of fishing Florida, primarily the west coast down to the Keys, but I also venture into freshwater and would like to see if 1 card can do it all since the 398 only has 1 card slot in it. Also my unit cannot use the platinum series of ccards, so it's plus or gold for it. Any help is appreciated.