thank you very much yes you are rightsFirst off I would set up a test bed of different coins. Have some buried at different depths and mark there position Then scan your MD over them one by one and take your own ratings for each one and write them down for future reference as to what it may be and what is the approx. depth of the target ! Other people's setting's maybe different on their machine or by different brands or soil conditions ! I would not rely on someone else's setting's !