Besides offering the very best marine magnetometers available in the world, Geometrics supports these systems with software packages to enable the experienced surveyor to log, plot and analyze the acquired data. One of the free software packages we offer is MagPick, a comprehensive magnetometer data plotting, gridding and analysis package available from our website.  Here we discuss the use of MagPick in detecting and analyzing the location of unexploded ordnance.

A Geometrics G-877 Proton Precession Marine Magnetometer (all yellow fish in opposite figure) was used to record data on a grid using MagLogLite.  After the completion of the survey, the data was loaded into MagMap2000 for a quick look at the anomalies. There is an easy method of setting flags in the MagMap profile display (figure below) which then are automatically transferred over to a GPS track plot to show the position of the anomaly in Lat/Long coordinates. Since the interpolator file from MagLog is a file of the interpolated fish position (not the GPS position of the ship), the anomaly positions are related to actual fish position.

After the initial review of the data in MagMap2000, the data can be exported to MagPick where the data are gridded and contoured for color map plotting.  The vessel track plot can be drawn on the color contour map such that the position of the vessel (or fish in this case) is visible (see figyre below).