iphone.cachers

So, while in Cleveland on a geocaching trip, I found the following on a concret slab near the river. What is this? If a benchmark, any reason why I cannot find it in the database? http://lh6.ggpht.com/_n0jRSLvTmQc/SvrMXRoK...00/IMG_0305.JPG I found it here: Latitude: 41.495499° N Longitude: 81.701836° W

Is this unit still available? I am in Columbus, Ohio.