MAGNETICS

We used IGM's GEM Mod. GSM-19MD Overhauser Effect Magnetometer. The sensor was towed at a constant offset of 220 m from ship's stern. Data were recorded at the rate of seismic shot acquisition by the NAVMAP computer.

The field data were reduced using the 1990 coefficients of IGRF. Some examples are shown in fig. 5.

Figure 5: BS98. Examples of IGRF90 magnetic anomaly data along MCS lines.