Thanks for these tips, Gungadoy. I use an iPhone sometimes, too, but usually I use my Garmin. I didn't take these coordinates while I was at the site of this benchmark, but on the map they are 40.61146 North and 75.96521 West. This is right along the Appalachian Trail below the Port Clinton fire tower in Berks County, PA. As the previous commenter pointed out, this is a USGS survey marker and I was attempting to look it up in NGS databases, which would explain why I couldn't find it. Again, I appreciate your tips on getting started with benchmarking.