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We used a duck decoy weight and masons line to find the drop offs on Oneida.
That’s how the original map of Oneida lake map was drawn by rope and weight and still has more info than a gps , I still keep 1 in the boat along with a compass
Most ADK lates are inaccurate in my opinion except for george and champ. Everythng else is a crap shoot. Ill use it for general basins of the lake, cross reference with other maps like iboating, then drill a bunch of holes. as i drill ill mark my navionics with pins and the correct depth so at least i can build a bit of a better contour map of areas i like to fish. Has definitely paid off for me. Sucks initially, but the payoff of finding a good, unmarked drops/humps that isnt pressured generally means ill have productive day fishing
There are units out there that map as you move along in the boat and they are a must have up there.
I just splash water on the ice to use the transducer to shoot thru.
This is what I do as well. If is super clear black ice, then you don’t even need the water.