lakemasters vs Navionics

[14gills]

Hi yall i have a question about mapping / chart sd cards.

I recently bought a humminbird 859ci hd di and was wondering who has used mapping / chart sd cards?

I bought the navionics hotmaps and plugged it in and it dint do anything but put roads on the land. It added nothing to the contours of the lake.

I just want to know your experience with the different mapping cards.

Thanks
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