Shark Tagging (IMAGE) University of Washington Caption Co-author Chris Fischer uses a putty knife to protect the shark's fin while attaching the tagging. Mary Lee, tagged off Cape Cod in September 2012, was one of two sharks analyzed in the study. The black tag on the fin transmits the animal's position when it surfaces with an accuracy of 5 kilometers. Credit OCEARCH Usage Restrictions With credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.