Birdwatch Note Rating
2023-06-23 14:22:48 UTC - HELPFUL
Rated by Participant: 1E9D35EBCB58530AE230F1FBD2E1D675F8ED60CADB503EC0C529593DEA7E0401
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Original Note:
Radio frequencies used by GPS cannot penetrate water beyond a few centimetres. https://link.springer.com/article/10.1007/s00190-018-1147-x Wildlife trackers with transmitting capability either use acoustic signals to a nearby vessel, or RF which requires the animal to surface or the tag to detach and float (by design). https://www.himb.hawaii.edu/ReefPredator/Tools.htm
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