If you see anybody doing this please report them...as the story says...this is a safety issue...especially for people un familiar with certain lakes...my guess is it's high school brats or ice fishermen (the last two times this has happened, that's who got caught)
http://www.wjjq.com/2017/01/11/local-snowmobile-clubs-dealing-with-people-striking-markers/
http://www.wjjq.com/2017/01/11/local-snowmobile-clubs-dealing-with-people-striking-markers/