My nephew purchased his first detector this summer. I showed him everything about his detector. A couple of days ago he told me that he hasn't found much since the first time we went hunting. He thought something was wrong with his detector. I told him to bring it over. I told him to find the coins in my coin garden. After all they are marked and in a strait line. He started swinging and couldn't get a signal. I watched in amazement as he forgot everything I told him. There he was swinging his coil a foot off the ground like a pendulum. I said that it's hard for a detector to find a coin 18 inches in the ground. I showed him (again) proper coil technique and told him to overlap his sweeps by 50% or more. He then found all the coins. He was happy! This may be the most important thing you can do is have a nice even low sweep. Overlapping your sweeps by at least 50%. I have watched youtube vids on metal detecting and some are jokes on proper coil sweeping.