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Day 3 - October 21, 2018


Today was our first day of logging. When we log, we log our position data, the depth the multibeam reads from the seafloor, the magnetics, the ship’s heading, and our speed. However, we weren’t able to record any data until we exited the EEZ, the 200-mile-wide Exclusive Economic Zone of Uruguay and Brazil. After we exited the EEZ, we launched an XBT, or an expendable bathythermograph. It measures the temperature throughout the water column; we use those values to correct the mapping data coming off the multibeam in order to get good depth readings. The final thing we deployed today was the magnetometer. It is lowered into the ocean off the port side of the boat using a winch; it hangs out there and collects magnetic data from the seafloor.