RD Instruments 1200 KHz ADCP File Formats:

velu_YYYYMMDD.dat and
velv_YYYYMMDD.dat --> U (east) & V (north) component average velocity
    Averages velocity data for each minute for first 11 bins of data

    Data format:
    YYYYMMDD HHMM  CCCC.C CCCC.C ... CCCC.C (format repeats for 11 bins/line)

    where YYYYMMDD = Date stamp
          HHMM     = Time stamp
          CCCC.C   = Average Current (cm/s) for each sample during the minute