Purpose:
Serves the primary purpose of detecting variations in the Earth’s magnetic field beneath the ocean’s surface, aiding in the mapping of magnetic anomalies on the seafloor.

Operation:
Deployed from ships or underwater vehicles, the marine magnetometer detects changes in the Earth’s magnetic field using sensors like fluxgate magnetometers. Towed behind the vessel, it records magnetic data continuously along the survey track, which undergo processing to create detailed maps of the seafloor’s geological features.

Purpose:
Creating detailed images of the seafloor and underwater objects in horizontal planes with high-resolution images.

Operation:
Emitting sound waves from a towed or stationary device, which then bounce off objects and surfaces underwater. These sound waves are detected and recorded by the sonar device, allowing for the creation of detailed images of the underwater terrain.