With fish they have tags that record light intensity, pressure and temperature which is enough to give a low res position estimate [1]. Not sure how well this w

With fish they have tags that record light intensity, pressure and temperature which is enough to give a low res position estimate [1]. Not sure how well this would transfer to this problem but it is cool tech. [1]: http://www.gtopppublications.org/repository/254_07-11-11_Blocketal98_MTS.pdf http://www.gtopppublications.org/repository/254_07-11-11_Blo...