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Well the idea is that your legs are your propulsion, and they are under the water, and so you can move silently and without any movement, other than the smooth, very slow motion of your upper body itself, which can blend in very well, unlike the fast movement of working a paddle above the water. Now, as for using a trolling motor on a small boat, that would work pretty well, but you still have a much larger profile moving through the water.
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