The G-858 MagMapper is a high sensitivity, fast-sampling ‘walking’ magnetometer. The high sampling rate of the instrument in continuous mode allows the operator to survey an area at a fast walking pace. In addition to being used as a walking unit, the G-858 can be set up for recording at a fixed location. Our G-858 MagMapper has a second sensor which provides the ability to measure the magnetic field gradient. The G-858 can also be used in conjunction with GPS, allowing for collected magnetic data to be mapped accurately.
For accurate magnetic surveys, we often survey a site with both the G-858 MagMapper and the EM61-MK2A in order to reinforce positive correlations.
The G-858 MagMapper is effective in locating the position and approximate dimensions of:
- Underground storage tanks
- Buried drums
- Construction and industrial waste
- Buried metallic waste
- Unexploded ordinance
Reinforced Concrete Magnetic Anomaly Map
Subtronic Corp. performed magnetic surveys with the Geometrics G-858 in this abandoned lot in search of buried reinforced concrete. Five anomalous areas were observed quite distinctly from the surrounding fill. This area was surveyed in under a day utilizing a grid system.