Not sure about Hummingbird, but I have the Lowrance and it is set above the bottom of the pad/boat. I actually have mine connected to the jackplate which is common in the bass boat world. Side imaging doesn't work over 5mph anyway so mine is in the water when going those speeds, but completely out of the water when running probably anything much over 5-10 mph. It is also protected against hitting anything since the transducers are so expensive.
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