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NGS Calibration Baseline starting point– Disk 0 M
Posted by: Groundspeak Premium Member 8Nuts MotherGoose
N 37° 51.993 W 089° 13.980
16S E 303581 N 4193358
Quick Description: This is the starting point for the National Geodetic Survey Gerstenschlager Calibration Baseline.
Location: Illinois, United States
Date Posted: 7/15/2010 8:40:54 PM
Waymark Code: WM98XW
Published By: Groundspeak Premium Member Ernmark
Views: 3

Long Description:
At this location extending southerly lies the Calibration Baseline for the purpose of calibrating survey instruments. It was dedicated by the Illinois DOT in 1988 in honor of one of its employees.
According to the information on the sign, the farthest mark is 1100 meters away. However, the distance that is stamped on each of the individual disks does not correspond with the proper distance. The 1100 M disk is found only 500 meters from the 0 M disk.
From the web site
THE 0-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "0 M 1988" SET IN THE TOP OF A 45 CM (18 IN) DIAMETER CONCRETE POST FLUSH WITH THE GROUND. IT IS 17.8 M (58.4 FT) SOUTH OF THE CENTERLINE OF THE PAVED ROAD, 4.4 M (14.4 FT) WEST OF THE CENTERLINE OF OLD HIGHWAY 51, 3.3 M (10.8 FT) SOUTHEAST OF A "PAINT TEST STRIP" SIGN, AND 1.0 M (3.3 FT) EAST OF A WITNESS POST.
Condition: Mark found in good condition

Designation: 0 M

Benchmark Agency: National Geodetic Survey

Monumentation type: other (not any of the below)

Monumentation type (if other): Calibration Baseline

County: Jackson

USGS 7.5' Topographic Quadrangle Name (optional): De Soto

Find type: Found by luck/skill/knowledge

Web address of this benchmark's datasheet (optional): [Web Link]

Benchmark Agency (if other): Not listed

Special category (optional): Not listed

Special Category (if other): Not listed

NGS PID: Not listed

Local database's URL (optional): Not listed

Visit Instructions:
  1. A closeup photo of the mark taken by you is required.
  2. A 'distant' photo including the mark in the view is highly recommended. Include the compass direction you faced when you took the picture.
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