Spray and Slocum gliders are autonomous underwater vehicles, or AUVs, that navigate underwater.  They do not need a human crew onboard or cables connecting them to research vessels at the sea surface to operate. These gliders are programmed by researchers to go where they are needed to do research, and are small enough to be deployed by small boats while still carrying a variety of sensors. They are used to take see-saw (Spray) and sawtooth (Slocum) vertical profiles of data, giving scientists a clearer understanding of the temperature, salinity, and turbidity of specific areas of the oceans. These measurements are then used to determine and understand ocean circulation and its role and influence on the global climate.