.I was lead to a marker by a geocache during a multi cache as an extra point of interest. I was able to log this benchmark. Then on my very next outing, I run across another, but I'm unable to log it. After MUCH research, I learn this is called a Transit Transverse Station as indicated by the TT on the marker number. I found data on it in a bulletin called Spirit Leveling in Missouri, although MO was a cooperating partner in a US Geological Survey. Is it possible to add this to the benchmark list so it can be logged as a find? See photos. Thanks! Mialmita
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