Brian McNamara, LAMP volunteer archaeologist and Flinders University graduate student, standing by with the magnetometer “fish,” waiting to launch it into the sea.
Magnetometer “Fish”
Image courtesy of the Search for the Lost French Fleet of 1565 Expedition, NOAA-OER/St. Augustine Lighthouse & Museum. Download larger version (jpg, 417 KB).

Brian McNamara, LAMP volunteer archaeologist and Flinders University graduate student, standing by with the magnetometer “fish,” waiting to launch it into the sea. The mag head or fish is towed by a length of cable some distance behind the boat. If it is too close to our boat, the steel of the hull or electrical noise from the boat engine could interfere with its magnetic readings.

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