I've never tried dowsing for water or looking for coins with a dowsing rod but I know for a fact that I can witch and locate areas of disturbed earth, such as buried pipelines and gravesites. In the oilfiled, a lot of companies use poly pipe and do not lay a lead wire with them for locating with a pipe locator. I can easily find them with a pair of bent wire flags. I've located more than a 100 of them and the backhoe always finds them right where I say they are. I can also locate gravesites in cemetery plots. A lot of times, people were buried and for whatever reason, no stone or marker was placed. Many, many years later, relatives want to know where open areas are in their family plots, but don't know where all the folks are buried. My bent wire flags will easily locate the perimeter of the exact rectangle of the dug grave from over 100 years ago. I started looking at cemeteries back several years ago when my father died and our own family plot had this problem. I knew I could locate pipelines, but had never even thought about anything else. We were desperate, so I gave it a try. My brother knew who and how many were buried in the plot but only a few had markers. Within an hour, I had located all of the burial spots and found we needed to move a grave of a small child from a poor family that my grandfather had donated a space to back in the '30's. We knew it was the child's grave as it was the only small rectangle that I found. After getting the proper permissions, we hired some men to manually dig up the remains, and we found her exactly within the rectangle I had marked out. The old wood coffin that my grandfather had made for her had mostly disintegrated, but her remains were mostly intact and were reverently moved to a new spot within the plot so we had room for my dad and my stepmom to be together when she passed a few years later. Creepy, but true. Now, not all people can do this. I've seen a lot of people try but nothing happened. The rods just lolled around in their hands. Mine go on point like a bird dog!! Maybe one day I'll find that buried treasure chest!! Yeah, right!!