I have the Navionics Platimun maps - which esentially gives you contours and general depths for most lakes in Western Canada. I purchased this like 7 years ago and at that time, the Lake master did not have a fraction of the lakes pre-mapped on there but maybe they have updated and added more now - maybe Sam or someone can comment.
Either way, I'd google it and see which one has more lakes, maps and features you want - those are the two options I know of.
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