High resolution seafloor mapping

Yesterday the local NBC news channel rode along on the Clifford A. Barnes ( the boat I sailed as mate this summer) to see a demonstration of a Konsberg multi-beam.  The scans provide 1cm of accuracy.  They took students out for some mapping of a sunken minesweeper and old barge on the bottom of Lake Union.

http://www.king5.com/story/tech/2014/11/03/high-definition-sonar/18443291/

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