You do need a mapping card if you want depth contours of the lakes you're fishing (depending on the lake). I recommend the Premium chart, has the same 2D contours as the platinum, but runs faster on the 798ci HD SI and is $50 cheaper.

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You do need a mapping card if you want depth contours of the lakes you're fishing (depending on the lake). I recommend the Premium chart, has the same 2D contours as the platinum, but runs faster on the 798ci HD SI and is $50 cheaper.
