When I was younger, I got to fish out of a spear shack up in northern Minnesota.  It was a blast watching the fish come in to the bait. 

Now, I've watched several videos on Utube where they cut a large sight hole and fish (usually) laketrout out of it.  What I've never seen is how they mark the hole when they leave so someone doesn't drive/step on it.

I'd love to do this for my kids, make it more exciting for them, but the pessimist in me can't help but see a lawsuit down the road.

Anyone around WI (besides Winnebago) do any sight fishing for pannies - what did you do to mark the hole for safety?

Thanks.