Twenty neutrally buoyant SOFAR floats were used in the Mid-Ocean Dynamics Experiment (MODE) to study the structure and variability of the deep ocean currents. The floats were clustered so that the pattern of motions could be resolved (mapping and pattern recognition). A number of float trajectories are shown and the very individual character of their signature is emphasized. Some floats remain nearly stationary for a year whereas others will cover hundreds of kilometers to the south or west in just a few months....
Rossby, T., A. D. Voorhis, and D. Webb. 1975. "A quasi-Lagrangian study of mid-ocean variability using long range SOFAR floats." Journal of Marine Research 33, (3). https://elischolar.library.yale.edu/journal_of_marine_research/1326