When the ship is "on step" sampling depth is approximately less than 6 inches.
Assumption is nominal depth of 0m.

GMT:
  Time of the observation.
  FORMAT: HHMMSS
  
  Example: 182212 = 18:22:12

GMT date:
  Date of observation in GMT.
  FORMAT: DDMMYY

  Example: 310509 = 2009-05-31

Viable:
  good data code(=65)

Decimal Lat:
  Latitude in full decimal format (North=+, South=-)

Decimal Long:
  Longitude in full decimal format (East=+, West=-)

Lat +/-:
  Latitude in a formatted decimal number (North=+, South=-)

  FORMAT: [-]DDDMM.mm

  Example: 6026.80 = 60 degrees 26.80 minutes (North)

Long +/-:
  Longitude in a formatted decimal number (East=+, West=-)

  FORMAT: [-]DDDMM.mm

  Example: -14655.62 = -146 degrees 55.62 minutes (West)

Lat:
  Another latitude

N/S:
  Seems to be fixed at 78.00, flag N = 78.00

Long:
  Another longitude

E/W:
  Seems to be fixed at 87.00; flag W = 87.00

SOG:
  (speed over ground, knots)

COG:
  (course over ground, degrees True)

SS Temp:
  Temperature [degC]

SS Cond:
  Conductivity [S/m]

SS Salinity:
  Salinity [PSU]

SS Flouresence:
  Flouresence [Volts]

SS Transmissometer:
  Volts

--------------------------

The first line of each file provides information (albeit somewhat 
redundant and, perhaps, confusing) about the file format.

Columns left to right

GMT (hhmmss)     time of data acquisition
Date (ddmmyy)     date of data acquisition
good data code(=65)
decimal latitude
decimal longitude
latitude (degress and decimal minutes)        e.g. 6005.93 = 60 degrees 
05.93 minutes
longitude (degrees and decimal minutes)    e.g. -14926.62 = -149 degrees 
26.62 minutes
latitude (degress and decimal minutes)        e.g. 6005.93 = 60 degrees 
05.93 minutes
latitude code (North latitude = 78.00)
longitude (degrees and decimal minutes)    e.g. -14926.62 = -149 degrees 
26.62 minutes
longitude code (West longitude = 87.00)
SOG (speed over ground, knots)
COG (course over ground, degrees True)
thermosalinograph temperature (degrees Celsius)
thermosalinograph conductivity
thermosalinograph salinity
fluorescence (volts)
transmissivity (volts)