Wildlife Conservation Society shark researcher Ramsn Bonfil fixes a satellite tag on the dorsal fin of a great white shark. The tags enable Bonfil and other scientists to track sharks in near real time: Whenever a shark's tagged dorsal fin breaks the ocean surface, the device uploads a satellite radio signal. The feed can deliver data to desktop computers in only an hour or two.
The information helps scientists learn where and how the animals spend their time. Data on depth, water temperature, and light levels allows researchers to measure a shark's daily movements in 3-D.