Large reptilians are often mounted with GPS located radio tracking device.

[Lawsen]

Large reptiles like crocodiles and pelagic sea turtles are often mounted with GPS located radio transmitter tracking device.  The device is epoxy/resin glued onto the carapace of the turtle or rough leathery skin of the crocodile, while in a tranquilized state, scary. 

http://www.seaturtle.org/tracking/?tag_id=85691

http://www.seaturtle.org/imagelib/?photo=3358

http://www.seaturtle.org/tagging/satellite.shtml

One radio tag per sea turtle costs $3,000.00 USD with satellite time.  The turtle has to swim with added weight on their carapace shell, thus cause hydrodynamic drag, thus a discomfort for the pelagic animal to swim.

Reptile tracking devices are made by:
Sea Mammal Research Unit, U.K, Sirtrack, New Zealand, Telonics, U.S.A., and Wildlife Computers, U.S.A.

Alejandro Fallabrino picture showing a turtle enthusiast searches for the radio tag sea turtles with a large directional Yagi-Uda antenna with reflector element and driven half wave (usually) dipole antenna:

http://www.seaturtle.org/imagelib/?photo=1781

http://en.wikipedia.org/wiki/Yagi_antenna

[Time]

Where is the antenna in that picture, I don't see it.

[slateraptor]

She can track my enthusiastic turtle any time.

[Achilles]

Hmmm, not that uncommon.
I have met an herpetologist who tracked little poison part frogs (about 1inch in size) with transpoders. They made something similar in a big tropic hall in the Zoo of Zürich.
The Idea was to look for moving patterns of individual animals and get a view on their social behaviour.
...lucky guy who can build all that stuff and play with it

[Mechatrommer]

Where is the antenna in that picture, I don't see it.

maybe a "bigger" and "longer" "unipole antenna" is better for her.

[Achilles]

Where is the antenna in that picture, I don't see it.

maybe a "bigger" and "longer" "unipole antenna" is better for her.

Hehehehhee,you really like the "Dicke Bertha", don't you