Magnetometer

Detection of sunken treasures

Magnetometers are precision electronic instruments that measure and display the strength of the earth's magnetic field in an area. If ferrous metal is present, the earth's magnetic field is altered and the readout of the magnetometer changes accordingly. Almost every major wreck find was made with a magnetometer. The Spanish galleons laden with gold and silver were also found with magnetometers by detecting the ship's anchors, cannons or cannon balls.