Because fluxgate gradiometer magnetometers and most metal detectors are continuously-sensing instruments, they are good for "sweeping" the area of concern. For large sites, they may also be connected to analog or digital recorders to produce continuous profiles along multiple parallel lines across the site. In this form, the data may be computer-processed to generate anomaly contour maps of the site, providing a documented record of the survey as well as allowing an overall appraisal of the distribution of buried metal. Such maps clearly reveal patterns of trench orientations, landfill boundaries, and utility routes. Geosphere's personnel have had extensive experience with many of these various instruments in many different situations from military applications (clearing unexploded ordnance - UXO's) to landfill delineation, and locating lost equipment in rivers and marine waters.

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