PMEL ADCPs are set to record measurements in 44 depth cells using 8.68 meter nominal bin widths.

When the ADCP converts the time traveled by the acoustic beam to a range from the transducer, it assumes a sound speed of 1475.1 m/s. For our systems, (with heads at 20 degrees from vertical) this results in a nominal bin width of 8.68 m as the vertical distance between successive depth cells.

To correct the bin widths for sound velocity:

actual bin width = nominal bin width * C / 1475.1 m/s

where C is the mean sound velocity for a given depth bin interval.