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I'm in the market for a new graph and want to buy a combo fishfinder/chartplotter. I've been doing some research and am leaning toward Lowrance, I currently have a Humminbird 717, so realize that the holes I have already drilled would match if I bought another "bird". However, I also like the Garmins, but have less knowledge of their mapping software, mainly is their detail the same, better or worse than the mapping software the other two offer. I know I am going to get a lot of comments saying buy this one or the other, what I am mainly interested in is people's experience with the mapping software for each brand. - how much coverage do they have? - what is the detail like? 1 foot contours, 5 foot, 10 foot, or does it vary and if so, what % is 1 foot? - and generally how have the graphs you use stood up to the elements, ease of installation etc? The one thing I don't like about my 717 is the flimsiness of the base, rotation piece. It has been broken for some time now and I always found it extremely difficult to disconnect the head from the base so I could store it away, probably why it broke. Also, will the units accept Topo map software either internally, or through an SD card? Any info would be greatly appreciated, thanks in advance.