Operation of Combined Navigation and Survey

This arrangement consists of a magnetoscope linked to a navigational system and a sounder which feed information into a software program installed on a Macintosh computer. The system was initiated by the Naval Archeological Research Group (GRAN), and the Society for Naval Archeology and Prospecting.

The method used to detect a ferrous mass under water is to find an anomaly in the Earth's magnetic field with a magnetoscopic probe towed by a ship.
While a systematic survey has as its goal the discovery of shipwrecks and their pinpoint location, it can also establish that a certain zone is clear of wrecks.
For that reason, precision navigation and complete data collection are imperative.