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I found an interesting article that describes the use of coordinates in China. They have come up with a coordinate system that, unless you have a secret decoder ring, can result in errors of 500 to 700 meters. And you need to license it to be able to use it.
https://en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China#Coordinate_systems
Can't let those coordinates fall into the wrong hands...
I tried to look for this station about 30 years ago...didn't quite get there...yet they still have it listed in the NSRS
https://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=JV4193
Posted : January 16, 2020 12:53 pm
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JV4193 appears on Google Earth to be in a large fenced compound. Edit: I think it's Camp David.
There is a 2010 Geocaching log that says
This benchmark is located in a "limited access" portion of the park, and is not accessible to public inspection.
Posted : January 16, 2020 2:24 pm
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Yes, it is Camp David. I looked for it around 1986 or so when I was working on a state boundary survey...the sign outside says "US Navy Facility, Entry Prohibited" or something like. I went in anyway, and after going around a bend there was a sign..."Welcome to Camp David". I did a quick U-turn, but a humvee full of armed guards caught up to me and detained me, made me go to the security office and explain myself. I must not have been the first surveyor to try that, because as soon as I told them my story there were OK with it. Needless to say I didn't get to use the station (if it is even still there).?ÿ
When I went to India in the mid 90's to work in Dhanbad they had no idea what GPS was, but they would not let us leave the country with any maps or photos larger than a certain scale.?ÿ
Hard to relate to this concept when we are so open with mapping and coordinates, etc.?ÿ
Posted : January 16, 2020 3:39 pm