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when I bought my new unit they were offering a rebate deal and the card ended up costing about $50, so I bought it...IMHO, unless you are traveling in unfamilure waters and do extensive cruiseing, it's not worth the big money...it's got some neat features, but for the most part, in my case, I never use them, and have to zoom in to keep them from cluttering detail I want to see...the 3D bottom contour can be difficult to diceifer, the pre loaded charts give exellent detail and for me are more than enough...My.02
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