Nope, though I will admit to "churning mud" with the prop a time or two. Some places up here the glacial silt and thermoclines combine to make the depth finder useless. A hard thermocline can read as solid bottom in some glacial bays, and in others the silt is so deep and soft it doesn't read as bottom at all. Knock wood...
I have expected to, looking for an anchorage in some less than hospitable and poorly charted places where I REALLY wanted to look around without kayaking (for miles) to get back from a known decent anchorage. Most of my part of Alaska, except for the shipping lanes, is very poorly charted.
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