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The SPLASH10-F-321 is a data-archiving, Argos satellite transmitting tag designed for tracking vertical and horizontal movements of free-range marine animals like rays, turtles, whale sharks, and basking sharks. The SPLASH10-F-321 tag is a towed tag. A towed tag is attached with a tether and anchor and is towed behind the animal.
It is Fastloc that sets this tag apart: