Sidescan Sonar

This seismic sensor provides an image of the acoustic contrasts on the sea-bed, on a band of 50 metres on each side of the boat. It reveals rocks and other objects lying on the sea-bed and can give an indication of their size by measuring the shadow, which they project. Magnetometers can simultaneously determine whether these targets are magnetic or not. By juxtaposing geographically positioned bands, the sonar information can be used to create a mosaic of the surveyed area.