Above Ground Markers (AGM) are devices that record the time that a pigging tool passes by a specific surveyed location. This allows for time and location logs that are then used in inertial processing to accurately and precisely map out any anomalies or features of interest as well as correct for any chainage errors.
At PipeSeek we work with customers to ensure the best location of AGM placements and record those locations with precision and accuracy to the DR - Sub-decimeter.
Included in a typical AGM Survey: