Matt in IL

I have this same problem with the 11" coil at the heavy iron sites, but have noticed a few things that has helped me... Pan Head/Roofing style nails with a wide circular head are the worst at any depth. They will give consistent high tones on a 90* swing with a mildly tight TID due to the roundness of the head. Deep square/cut nails tend to only high tone one way and are usually pretty jumpy on the TID. There is most definitely a harmony that has to occur here between Sensitivity, Recovery Speed, and Iron Bias. Without this harmony happening, you are going to get some heavy falsing. Another big thing that has been evident is how wet the soil is. In my dirt, the falsing is amplified when the dirt is soggy. Don't be afraid to lower that sensitivity down to 17-18 when it's wet as you will still get excellent depth when the ground is wet as we all know. I do a lot of woods detecting at old home sites or active farms that date back to the mid 1800s. This is my basic "power-on" settings for these type sites and adjust as conditions dictate: Park 2 - Multi - 5 Tone - Sensitivity 18 - Recovery Speed 5 - Iron Bias 2 - Auto Ground Balance (Pumping) I run wide open Disc, but have some weird break points/audio ranges setup for Gold. Also, I do not use the pinpoint button generally. I isolate the target then approach it both ways to locate it. This will tell you A LOT too. Matt