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A spud?
Funny you posted this today. I was thinking the same thing this morning. I was wondering if a forstner bit with an extension might work. Plus, if you wanted to check depths, you could get a bit a little bigger than a transducer. If the ice is good a few inches down you might not even have to drill all the way through, just enough to get past the cloudy ice, then put some water in the hole. It could also be used to drill a hole next to your regular one to keep the transducer away from your line while jigging.
. Unless in a shanty that would freeze in in a heartbeat !!
So, I like to fish off the beating path a lot. Some lakes are void of anglers, so I have to check ice conditions all the time. Checking ice thickness with my 8" nils can kill a few batteries. Since I'm using the Milwaukee drill with my nils, I can just switch it out with a wood bit. I figure if I buy a 12" wood auger bit, and I don't hit water, I'm good to go for a vehicle. I've used this type of auger bit before on the ice for work purposes, and they cut ice just fine. https://www.amazon.com/Hitachi-728252-1-inch-12-inch-Auger/dp/B0013WFYMSNot saying this is the best auger bit, but something like this will do the job.
Just get a 9ah battery for the Milwaukee, and continue to use the nils
I have the 9ah battery. Even with that, the cold temps we've been having really has an effect on the number of holes I can get. I could probably drill 1" diameter holes for a week straight instead of the 8" nils.