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| i ran the Lakemaster and Navionics chips side-by-side on the NW Angle this year, and talked a fair amount to Jeff about them when we were both up there on the lake...
both chips clearly used the Canadian paper maps in that part of the lake, and had not done their own mapping - missing some islands, listing some islands with trees as "submerged humps", etc. they both offer good overall accuracy (as the paper maps are quite good), but do not provide a level of precision that would come from doing their own mapping.
on a Humminbird unit the Lakemaster could highlight depth ranges, displays the travel routes, and you can turn off the contour lines - nice features for long runs. the downside was a very slow screen load when changing zooms.
the Navionics chips were uncluttered and easier to read, zoomed fast and smooth, but did not include the safe travel routes.
i must say i was disappointed in the advertising by Lakemaster. their website's coverage map shows the Angle as "high definition", and while this is technically true it was clear that they just filled in more lines to get 1' contours without actually doing their own mapping in that part of the lake. i dropped $120 for the chip based on the website and they should have been more clear about it.
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