Survey Marker - NGS Disc

This is a survey marker placed by the National Geodetic Survey, marking a point on the Sand Point Calibration Baseline. It replaces mark AI3598, which was 3m south of here but lost when the sports fields were redeveloped.

The position of the dot in the center is allegedly accurate to well under a millimeter, as measured from the other end of the baseline, 1061m away.


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