Time (UTC)      Time in Greenwich Mean Time
Time (Local)    Time at the ship
Lat (deg)       Latitude of ship's position in degrees (negative indicates south of the equator)
Lon (deg)       Longitude of ship's position in degrees (negative indicates degrees west from the Greenwich Meridian)
Hdg (deg)       Heading of ship in degrees clockwise from North
P (mb)          Surface pressure in millibars
T (*C)          Surface temperature in degrees Celsius
RH (%)          Surface relative humidity in percent
Wd (deg)        Wind direction in degrees clockwise from North
Ws (m/s)        Wind speed in m/s
Octa		Fraction of the sky covered by clouds in 8ths
CL		Low cloud type
CM		Middle cloud type
CH		High cloud type