Yeah there is a ton of false information floating around out there. I've heard many a tall tale in my 42 years in this hobby and these tales will be unloaded on you with a straight face.
The only way to find out about any machine is to use it for at least 100 hours or to rely on an expert who you know won't yank your chain.
To many people think you can run out and buy a detector and figure it out in a few hours. Tain't so. That's why a lot of detectors fail for new owners and where a lot of the tall tales come from, plus there may not be any targets deeper than 4-5 inches where they hunt. There is this myth that still lingers that all old coins are buried deep and that they are just everywhere. It's stupid but many buy into it. In all my years in this hobby I can count the really deep coins I have recovered on my two hands. I have pulled coins from the 1700's from only two inches down and clad coins at ten inches in the same area. So much for the myth.
Many people think all you have to do is turn a new machine on, wave it over the ground, and the coins will almost jump out of the ground. And if this doesn't happen, then in their mind the detector is junk. 99% of all the badmouthing you hear is based on sheer ignorance and total lack of experience. I 've known guys who changed detectors like they change socks and went through 10-30 machines in one year, and still with no measureable success because of all I have described.
The vast majority of dropped coins are well within the reach of most detectors out there, but the coil has to pass over them to find them. Most people out there don't realize that the signal from a concentric coil at peak depth is only covering an area about the size of a quarter. They have this delusion that if their coil is eight inches in diameter that it is covering that same area at depth. I have written several articles on this very subject and I belive one or two are in the online magazine at Treasure Depot. I may do one with diagrams and maybe post it over on the story forum to help dispell this long-standing myth about depth.
Another myth centers around sensitivity. Many think that sensitivity equals depth and the higher you crank it the deeper the detector goes. WRONG!! When one increases the sensitivity they not only make the coil more sensitive to the target they seek but also more sensitive to everything else in the ground, including mineralization, thereby cancelling out any good targets that may be present. The first thing any new user does is crank that sensitivity to the max and set out to find those mythical coins buried halfway to China.
Sometime ago I told one fellow ( who was complaining about depth ) to jack his sensitivity way down and try it. He went back over an area he had covered many times and found a slew of old coins he had missed before running in high sensitivity. He is now a believer.
Once one gets past the mythology and the ton of BS stories from folks who don't really know of what they speak, then their success improves immensely. I hear people all the time bad mouthing a machine they have never used and all they are doing is parroting what someone else who never used it has stated. If one has been around long enough to remember the detector wars that plagued the forums several years ago then it's easy to understand what I describe.
Bill