Whistles just complicate things in my opinion I use a noises I make myself, obviously use some words there name and come here, but I also use noises for find him like a "fssssssssssst", another for I've found him come get him "yayayayayaya" haha people must think I'm mad!!! I prefere the dogs to think for them selfs and hunt 20/30 yards in front of me so it's only when I've seen something myself or no there's something about I have to break silence.