#1) I received an interesting email from Matt with the following info on the US Coast and Gedetic Survey mark on Post #925 (Fort Scammon)
These benchmark disks are the actual points where a surveyor's plumb bob would have hung in the center of the disk (at the cross mark of the arrow.) This particular disk is called a 'reference mark', and the arrow actually points to another disk that is designated the 'station mark'. It is stamped with its unique designation and the year it was monumented, in this case 'FORT 1944' The disks are used as reference points for future surveyors and mapping.
You can find more information from the following link:
And I have included more detailed information from the NGS website (www.ngs.noaa.gov
> ) below. If you are wondering why I am writing you about this - 'Benchmarking' or searching for these disks is a hobby of mine and I stumbled across the picture you took of this one while searching on the internet. Hopefully this information will help you unravel some mystery behind the marker.
#2) I spoke with Joe Geiger a couple of weeks ago when I was in Charleston. He is going to send me a list of recently added markers. There are about 20 new markers that aren't even on the original list or have been missing for years. I will post the list ASAP and we can head out for some new adventures.