I was out with a new found ice fishing buddy over the weekend and he had a couple of homemade ice picks to aid in crawling out if you would happen to fall through. He cut two 7" sections of broom handle, drove a 16 penny nail in then ground the head to a point. He then drilled a hole in the opposite end and tied a 2 1/2' piece of string to them. He wore them around his neck at all times. A PDF is also highly recommended and a 50' piece of rope can also be a lifesaver.
