! SonTek ADVOcean and ADVField Hydra Systems:
! Column Headers for ADV .HDR Files - Heading and velocity data have not been corrected to True North
! 
! Col#  Contents  (Units) 
!  1 Burst Number (#)
!  2 Year - Start of burst averaging interval (GMT)
!  3 Month - Start of burst averaging interval (GMT)
!  4 Day - Start of burst averaging interval (GMT)
!  5 Hour - Start of burst averaging interval (GMT)
!  6 Minute - Start of burst averaging interval (GMT)
!  7 Second - Start of burst averaging interval (GMT)
!  8 Sampling rate (Hz)
!  9 Samples per burst (#)
! 10 Recorded data  (#)
! 11 Speed of sound used for velocity computations (m/s)
! 12 Distance to the boundary from probe tip (-0.01 if not detected) (cm)
! 13 Distance to the boundary range from center of
!    sampling volume (-0.01 if not detected) (cm)
! 14 Battery voltage (V)
! 15 Mean velocity - East (cm/s)
! 16 Mean velocity - North (cm/s)
! 17 Mean velocity - Up (cm/s)
! 18 Mean signal strength - Receiver 1 (counts)
! 19 Mean signal strength - Receiver 2 (counts)
! 20 Mean signal strength - Receiver 3 (counts)
! 21 Mean correlation - Receiver 1 (%)
! 22 Mean correlation - Receiver 2 (%)
! 23 Mean correlation - Receiver 3 (%)
! 24 Mean heading (degree)
! 25 Mean pitch (degree)
! 26 Mean roll (degree)
! 27 Mean temperature (degrees C)
! 28 Unused (#)
! 29 Mean Paros (dbar)
! 30 Mean OBS 1 (counts)
! 31 Mean OBS 2 (counts)
! 32 Standard deviation of velocity - East (cm/s)
! 33 Standard deviation of velocity - North (cm/s)
! 34 Standard deviation of velocity - Up (cm/s)
! 35 Standard deviation of signal strength - Receiver 1 (counts)
! 36 Standard deviation of signal strength - Receiver 2 (counts)
! 37 Standard deviation of signal strength - Receiver 3 (counts)
! 38 Standard deviation of correlation - Receiver 1 (%)
! 39 Standard deviation of correlation - Receiver 2 (%)
! 40 Standard deviation of correlation - Receiver 3 (%)
! 41 Standard deviation of heading (degree)
! 42 Standard deviation of pitch (degree)
! 43 Standard deviation of roll (degree)
! 44 Standard deviation of temperature (degrees C)
! 45 Unused (#)
! 46 Standard deviation of Paros (dbar)
! 47 Standard deviation of OBS 1 (counts)
! 48 Standard deviation of OBS 2 (counts)
! 49 Unused (#)
! 50 Unused (#)
! 51 Unused (#)
! 52 Unused (#)

