This disk contains the Athena data collected on KNORR cruise
KN172-3 (February 2003, Craig Lee) and post-processed true
wind data - Speed (m/s) & direction (degrees true).  The
Athena data files contain true wind data caluclated with
an incorrect sensor mounting offset value of 30 degrees.
The true wind values on this disk use a value of -15 degrees,
which has been selected by analysis of the Feb. 12 data.

The following metadata has been extracted from the Athena
data log:

IMET Wind (IMET_WND)
  Format: X, Y, Total, Max, Min, LastVane, LastCompass, C1, C2

	Wind X (m/sec), Positive for a stbd to port wind
	Wind Y (m/sec), Positive for a bow to stern wind
	Wind Total (m/sec), Averaged over previous minute
	Wind Max (m/sec, 15 sec interval),
	Wind Min (m/sec, 15 sec interval),
	Last Vane Reading (deg),
	Last Compass Reading (deg),
	Counter1 ("0"), Counter2 ("4")
	
	Note - Wind direction is not provided as a
	  single quantity.  Direction values are ship relative.
	  The wind sensor does not have a compass installed
	  (value should always be 0.0).

  Calibration - Jan 2003 

True wind direction (Wnd_Dir)
  Format:  Wnd_dir  (degrees)
  Wind direction obtained from the IMET wind sensor and corrected for ship
  heading (gyro) plus ship course and speed (GPS SOG & COG).

True wind speed (Wnd_Spd)
  Format:  Wnd_spd  (meters/sec)
  Wind speed obtained from the IMET wind sensor and corrected for ship heading
  (gyro) plus ship course and speed (GPS SOG & COG).


True wind speed & direction (TWind)
  Format:   Speed, Direction  (meters/sec, degrees)
  Wind direction is given in meteorological terms; a 0 degree wind comes from
  the north.  Ship speed and direction of travel are obtaned from GPS data
  (GGA SOG & COG).  Sensor mounting orientation is corrected using the
  direction the ship is pointing obtained from the gyro (the ship is not 
  necessarily moving in the direction its pointing).