Just to follow up on my previous comments, I have old bathymetric paper maps that were done by the government back in the 70s-80s with a handline. They look identical to the maps on the Navionics chip for Canada. I suspect all they did was upload those exact maps, which are completely inaccurate. The shorelines and depths do not match and they don’t show many smaller lakes.
I would save your money and use it for gas to autochart your own maps.
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