Fundamentals of Operational Display – ½ day Magnetic Principles – ½ day Operational display and Search Patten Planning – ½ day Search Pattern Planning – ½ day Post Processing – ½ day Outline G-882 Cesium Marine Magnetometer Training Course

Introduction Geometrics, Inc. Premier Manufacturer of Marine Magnetometers Slide 2

Single sensor Magnetic surveying is used to provide basic geologic information for oil/gas exploration and marine mining projects. It is used to do basic research into rock types and geothermal activity including the location of kimberlite diamond pipes. It is used to locate dumping grounds of toxic materials, ancient and valuable shipwrecks of archeological significance. Magnetometry is used as a security tool to ensure that harbors and near coastal zones are clear of submarines and other military material such as mines. Marine Magnetometer – G-882 Slide 3

Marine magnetometers are deployed in coastal zones the world over for geological, military, environmental, archeological and marine engineering purposes. Provides the maximum detection capability for * sunken vessels * pipelines * sewage outfalls * fiberoptic telecommunication cables * power cables * various other infrastructure components G-880 with Flotation Device Slide 4

Earth’s Magnetic Field Earth’s Magnetic Field: detection of magnetic anomalies Earth’s dipole magnetic field is perturbed by relatively localized contrasts in magnetization. Magnetization contrasts are caused by ferrous debris, vessels, pipelines, communication cables, magnetic minerals (predominantly magnetite). With magnetometers, one can measure the total field to detect the magnetic anomalies associated with contrasts. Earth’s dipole (N-S) magnetic field is produced by internal iron core dynamo effect. Charged particles from the sun cause a bow shock wave in the magnetosphere which leads to Diurnal Variations Slide 5

Typical marine magnetometer system set-up for single sensor survey SENSOR SHIP ON-BOARD DATA LOGGER AND PROCESSOR Not to scale GPS MAGNETIC BODY North Data Acquisition: Single Sensor without Telemetry Slide 6

Typical marine magnetometer system set-up for dual sensor (gradiometer) arrays SLAVE SENSOR MASTER SENSOR SHIP ON-BOARD DATA LOGGER AND PROCESSOR Not to scale GPS MAGNETIC BODY North Data Acquisition: Gradiometer without Telemetry Slide 7

Typical marine magnetometer system set-up for single sensor survey TELEMETRY SENSOR SHIP ON-BOARD DATA LOGGER AND PROCESSOR Not to scale GPS MAGNETIC BODY North Data Acquisition: Single Sensor with Telemetry Slide 8

Typical marine magnetometer system set-up for dual sensor (gradiometer) arrays TELEMETRY SLAVE SENSOR MASTER SENSOR SHIP ON-BOARD DATA LOGGER AND PROCESSOR Not to scale GPS MAGNETIC BODY North Data Acquisition: Gradiometer with Telemetry Slide 9

Slide 10 Cable Profile

DC Power Supply 28-35VDC MagLog Data Logger m Short Cable Cesium Magnetometer Diagram RS232 Junction Box On-Board Cable RS-232 & Power Winch Sensor Electronics Driver And CM222 Counter G-882 System Block Diagram COMPUTER Slide 11

Remote Sensing DC Power Supply 28-60VDC MagLog Data Logger m RS232 Junction Box On-Board Cable RS-232 & Power Winch Slave Sensor G-882 System Block Diagram COMPUTER Master Sensor Electronics Driver And CM222 Counter Medium Cable Cesium Magnetometer Diagram Slide 12

Constant Current DC Power Supply VDC MagLog Data Logger m RS232 Junction Box On-Board Cable RS-232 & Power Winch Slave Sensor G-882 System Block Diagram COMPUTER Master Sensor Electronics Driver And CM222 Counter Telemetry Deep Tow Cesium Magnetometer Diagram Slide 13

G-880 Magnetometer Sensor Pressure Vessels Slide 14

MagLogNT Digital Data Acquisition System with position interpolation Slide 15

MagLogNT And MagLogLite Data Acquisition Software Slide 16

MagMap2000 Data Processing Software Slide 17

Using 34 meter GPS Offset CorrectionNo GPS offset Correction GPS Offset Correction Contour Maps Slide 18

Using 34 meter GPS Offset CorrectionNo GPS offset Correction GPS Offset Correction Profiles Slide 19 Distance in meters Magnetics in nT

Magnetic Model of 20 Meter Sunken Ship at 300 Meters Depth Slide 20

Data Courtesy of Ark Geophysics Seabed Cable Anomaly Detail - 3 km filter (note scale of anomaly is high-resolution at 0.22 nT). Data Processing – Pipeline Contour Map Slide 21