There is nothing in the Maryland regs about the use of radios. My son and I use them. To me it adds to the excitement of the hunt when we call each other to say we see a deer. (He calls me sometimes to see if I am still awake). It's also nice to call and say , "How much lnger you going to stay on the stand?" Whenever I hunt I always have my cell phone with me but not turned on. I figure at age 60,and especially when hunting alone, it makes me feel safer that I can call someone if I get into trouble.