Day 1, April 19th, 2016.

We left the dock. And made it all the way to… San Diego Harbor.

The first order of business was calibrating the acoustic equipment (the EK60).  The acoustics are used to find distributions of hard-bodied plankton and fish in the water column.  The difference between acoustics and nets is that the acoustics are running continuously throughout the cruise, and then the nets can help clarify what the acoustics are detecting by sampling those acoustic layers at discrete moments.

To calibrate the acoustics, we first anchored the boat.

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Then we triangulated a metal sphere under the boat that the acoustic beam can see easily. To triangulate the sphere in different spots, we used down riggers that basically looked like fishing poles. It took all day, but the scientists helping were troopers!

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