Spy on your favorite Tiger, Hammerhead, and Bull sharks in our custom-designed Google Earth interactive map.


Tracking GM

Species: Scalloped Hammerhead
Scientific Name: Sphyrna lewini
Date Tagged: March 17, 2010
Location Tagged: Near Marathon Hump off the coast of Marathon Key, Florida Keys
Gender: Female
Total Length (TL): 200cm

About GM

The Story Behind the Name: In honor of Marian Dunlap, the grandmother of our boat Captain Curt, the team named our only scalloped hammerhead GM. Her generous donation, in remembrance of her late husband R.J. Dunlap, allowed for the Dunlap Program to be founded. Marian is a strong, but selfless woman who saw an opportunity to expand our understanding of marine ecosystems in order to protect them for generations to come.

Satellite Tagging: GM was carefully tagged with the latest in satellite tag technology providing us with the first opportunity to follow the long term movements of these threatened species. As you can see, most of her tracks are concentrated around the Marathon Hump, where she was tagged. Please keep checking back frequently to follow GM’s movements, which will be updated every few days as her satellite tag continues to send us real-time tracking data.

Adopt-a-Shark: For information on how you can contribute to our shark conservation research by adopting and tracking your own shark, please visit our Adopt a Shark page.

System Requirements

Google Maps renders in all modern browsers and mobile operating systems. For more details visit Google’s map support page to view detailed system requirements.


To animate our interactive shark tracking, play with the time slider tool in the map upper-left. Simply, go to the slider & separate the bottom left & right tabs by ~1/4”. Then click on the leading tab & drag it across the slider; or click play to automatically view tracks.