MAGNETOMETRY

The Geometrics Mod. G-811 was used. The towfish was kept 180 m off the stern. The data was collected by the NAVPRO workstation on NS lines 2.0-2.5 km apart, including some diagonal lines, as dictated by multibeam coverage and multichannel seismic line patterns.

The following data processing steps were applied:

• extraction of the navigation and total field ASCII data from the NAVPRO data files
• polar transport (220 m distance, angle (hdg-180)) to get the towfish position
• application of the IGRF 2005 to every point
• production of grids in geographical/metric coordinates for QC and analysis (step 0.75 nm/0.5 nm and 100 m)