(Summary and Field Guide)


1. Obtain the data sheets for the Geodetic Marks in the area you wish to work.

2. Discard the Data Sheets for any marks that have been recovered in the last two years.

3. Plot the mark's location on a map and arrange the sheets on a convenient order to visit.

In the Field:

4. Follow directions given in each description to the general vicinity of the mark.

5. Locate local reference points or landmarks from information provided, specffically looking for reference tags, orange arrows on the edge of the road, witness posts, etc.

6. Measure distances and directions from local references. Establish intercept.

7. Locate mark by probing ground or use metal detector.

8. Expose mark, if buried. Check inscription, note and record condition of the mark. Check distances and compass directions from local references, if necessary. Note significant changes in directions needed to locate the mark.

9. Take a picture of the mark, along with the GPS showing the Latitude, Longitude and Time of observation.


10.Open the on-line Geodetic Report form at Reporting.htm.

11. Check completed report for errors. Click on "Submit" to forward the completed report to the USPS CoCh Committee for processing.

The condition of the mark should then be noted using the following definition:

G = GOOD...disk is in good condition, easily read, with no signs of having been moved ('disturbed'). Disk shows little or no mechanical damage and no serious erosion or corrosion damage.

P = POOR...disk shows evidence of having been 'disturbed1 or moved as determined from measurements and/or condition of the soil or environment, or is severely damaged mechanically, scuffed, eroded or corroded.

N = NOT FOUND...disk is not found. If remnants of the station are found but the disk cannot be located, the station is classified as 'NOT FOUND' for NGS purposes.

X = DESTROYED...disk is found and is physically removed from the site. Disk should be returned to NGS.

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