Thank you all for your responses. I will go learn about the USGS benchmarks, and then check my accuracy against one.
I just figured that I had an issue, because my friend's unit was so accurate to the location. Then the next day , I took my son to look for another cache, but we could not find it. We were in a grass field, adjacent to a parking lot and 50-60 feet from any kind of cover that may hide a cache. The cover was thick, and I was not sure we were looking in the right place, so we gave up rather quickly.
Will try again and get back with you pros!
Thanks again,
Matt