a depth sounder will only show your depth directly below the boat and I recommend them to everyone. But still need to idle through any area you plan on boarding in, however, if you have stumps that you can hit in 20 feet of water...I would find a safer spot. We have barefooted in some lakes that had submerged trees...just under the surface...water level went down and we had been footing directly over a bunch of drowned trees. it was an eye opener.
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