You're gonna need a bigger boat. 

These tags are not going to stop moving! 

From our friends at Lansharkz comes this series of sea sharks!  Look out, these sea doggies are ready to hunt. 

The Shark Travel Tag series is trackable at Geocaching.com. 

This series is designed by Landsharkz.ca and is available for a limited time. 

Dimensions:  Approximately 50mm x 31mm