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| Correct me if I'm wrong, but in WI (probably elsewhere too) lakes that have contours on the maps but weren't mapped by the chip company are noting more than digitized DNR maps. So, however far off these maps are is how far off they will be on the chips - many of these were completed in the 1950-1970s with some being more accurate than others and some are completely off in areas of the lake. Only time on the water will tell you this.
For the Lakemaster and 1' contours, it's possible they mapped it themselves but don't have it in 1' contours to keep it from getting impossible to read, especially on deep lakes. For example, Big Green was mapped but doesn't show in 1' contours (on my chip) and I wouldn't want it to b/c there's areas that would be nothing but a solid black line of 1' contours stacked on top of each other - impossible to read.
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