Marine Magnetics

Local variations in the Earth's magnetic field are most often caused by ferromagnetic objects or other magnetic objects located in the vicinity. Through the measuring and recording of this variation, it is possible to detect objects submerged beneath the water (and sediments). An accurate map of the object's position can be created by recording the sensor's position along with the magnetic variation. The contour map can be overlaid upon nautical charts, engineering drawings or aerial photographs.

Marine magnetic surveys are carried out using a magnetometer specially modified for marine operations. The magnetometer is installed in a water tight tow-fish, which is towed behind the vessel using a tow cable.

Typical applications include:

• Archaeology;

• Geological studies;

• Mineral exploration;

• Search and recovery of submerged objects.