Transcript for Shark Tracking Data Made Available Online
Finally, those great white sharks right off our coast. Abc's linsey davis with how we can all track them. Reporter: Meet mary lee. The 16-foot long, 3,500-pound great white tagged and released just off the coast of cape cod. Oh, yeah, mary lee! Reporter: And this is chris fisher, who is responsible for putting sharks on the map. Literally. Watch as his team attaches a gps satellite tracking device to this great white. Now, each month, more than a million people are logging on to check up on the whereabouts of the nearly 40 sharks he's tagged. New yorkers don't tend to think about sharks -- Reporter: See this little orange dot? That's mary lee. In just the past six months, she's hugged the shoreline from massachusetts to jacksonville, florida. I had to call the authorities in jacksonville beach, because mary lee -- Reporter: Got too close? Look at this. She was within 200 yards of a surf spot in a public peer. Reporter: Are sharks coming closer than they used to? Nobody knows what they used to do. This is the first time we're establishing these tracks to undehat normal even is. Reporter: Fisher hopes his groundbreakinger are search will move people to protect these massive predators, and replace people's fear with curiosity. Linsey davis, abc news, new york.
This transcript has been automatically generated and may not be 100% accurate.