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What are the downsides to them?
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from the DNR's perspective, people using them to transmit the location of deer, like "big buck going east!" "some one get to the east road!"
that situation is going to get people all headed to the same spot, in a hurry. potential for a auto accident, shooting from vehicle/road, etc.
i don't see where using them to let everyone know that the posters are set, and the walkers can start, or that the walkers are through the section, and need to be picked up, or that we should go hunt the "farmer smith's" farm next, is a big danger