As much depth as the CZ3D does coil for coil. Also do they make a 5" coil for the ID Edge since Fisher was too cheap to make one.Hope Ralph makes one. I might even buy a Edge if I can get a 5" coil for it. A small DD would be better. I am going to make a pin pointer out of my ID Excell with a Sunray 1" coil. Well since I am retired now I got time to do things like that and hunt as much as I want to. Hell, I should have retired 5 years ago. Thanks , Jerry aka Tinfoil