study small scale ocean variability including internal wave and fine-structure data, point source release dye diffusion at 1000 meters, and oceanographic data for acoustic transmission experiments.

In a few operations, two SPURVs were run at once in lock-step, 1 above the other or one beside the other at constant spacings. This was to study spatial coherences of the small scale ocean structure. Most of the SPURVs operated with a vertical rake of temperature and conductivity sensors using what later became the Seabird sensors. In all