As this data is in netCDF format, file description is best undertaken by reproducing the header information from the file itself:
netcdf 26marnav {
dimensions:
time = UNLIMITED ; // (8558 currently)
namelen = 30 ;
variables:
char Site(namelen) ;
Site:type = "Header" ;
float Latitude(time) ;
Latitude:long_name = "Site Latitude; north is positive" ;
Latitude:units = "degrees" ;
Latitude:_FillValue = -99999.f ;
Latitude:valid_range = -90.f, 90.f ;
Latitude:type = "Header" ;
float Longitude(time) ;
Longitude:long_name = "Site Longitude; east is positive" ;
Longitude:units = "degrees" ;
Longitude:_FillValue = -99999.f ;
Longitude:valid_range = -180.f, 180.f ;
Longitude:type = "Header" ;
short Altitude(time) ;
Altitude:long_name = "Site Altitude" ;
Altitude:units = "Meters, MSL" ;
Altitude:_FillValue = -9999s ;
Altitude:type = "Header" ;
long TimeSeconds(time) ;
TimeSeconds:long_name = "Time; seconds since 1970-01-01 00:00:00" ;
TimeSeconds:units = "seconds" ;
TimeSeconds:_FillValue = -99999 ;
TimeSeconds:type = "Header" ;
long TimeNanoSeconds(time) ;
TimeNanoSeconds:long_name = "Nanoseconds of current second" ;
TimeNanoSeconds:units = "nanoseconds" ;
TimeNanoSeconds:_FillValue = -99999 ;
TimeNanoSeconds:type = "Header" ;
long AveragingTimeSeconds(time) ;
AveragingTimeSeconds:long_name = "Averaging time seconds" ;
AveragingTimeSeconds:units = "seconds" ;
AveragingTimeSeconds:_FillValue = -99999 ;
AveragingTimeSeconds:type = "Header" ;
long AveragingTimeNanoSeconds(time) ;
AveragingTimeNanoSeconds:long_name = "Averaging time nanoseconds" ;
AveragingTimeNanoSeconds:units = "nanoseconds" ;
AveragingTimeNanoSeconds:_FillValue = -99999 ;
AveragingTimeNanoSeconds:type = "Header" ;
long NumValues(time) ;
NumValues:long_name = "Number of values" ;
NumValues:units = "count" ;
NumValues:_FillValue = -99999 ;
NumValues:type = "Header" ;
long JulianDay(time) ;
JulianDay:long_name = "Julian day" ;
JulianDay:units = "day" ;
JulianDay:_FillValue = -99999 ;
JulianDay:type = "Data He" ;
float DecimalMinutes(time) ;
DecimalMinutes:long_name = "Decimal minutes of Julian day" ;
DecimalMinutes:units = "minutes" ;
DecimalMinutes:_FillValue = -99999.f ;
DecimalMinutes:type = "Data He" ;
long TrimbleStatus(time) ;
TrimbleStatus:long_name = "Trimble status" ;
TrimbleStatus:units = "pcode" ;
TrimbleStatus:_FillValue = -99999 ;
TrimbleStatus:type = "Data" ;
float TrimbleHDOPS(time) ;
TrimbleHDOPS:long_name = "Trimble HDOPS" ;
TrimbleHDOPS:units = "n/a" ;
TrimbleHDOPS:_FillValue = -99999.f ;
TrimbleHDOPS:type = "Data" ;
float TrimbleTrueCourseOverGround(time) ;
TrimbleTrueCourseOverGround:long_name = "Trimble true course over ground" ;
TrimbleTrueCourseOverGround:units = "degrees" ;
TrimbleTrueCourseOverGround:_FillValue = -99999.f ;
TrimbleTrueCourseOverGround:type = "Data" ;
float TrimbleSpeedOverGround(time) ;
TrimbleSpeedOverGround:long_name = "Trimble speed over ground" ;
TrimbleSpeedOverGround:units = "knots" ;
TrimbleSpeedOverGround:_FillValue = -99999.f ;
TrimbleSpeedOverGround:type = "Data" ;
float TrimbleAvgCourseOverGround(time) ;
TrimbleAvgCourseOverGround:long_name = "Trimble average course over ground" ;
TrimbleAvgCourseOverGround:units = "degrees" ;
TrimbleAvgCourseOverGround:_FillValue = -99999.f ;
TrimbleAvgCourseOverGround:type = "Data" ;
float AshtekHeading(time) ;
AshtekHeading:long_name = "Ashtek heading" ;
AshtekHeading:units = "degrees" ;
AshtekHeading:_FillValue = -99999.f ;
AshtekHeading:type = "Data" ;
float AshtekPitch(time) ;
AshtekPitch:long_name = "Ashtek pitch" ;
AshtekPitch:units = "degrees" ;
AshtekPitch:_FillValue = -99999.f ;
AshtekPitch:type = "Data" ;
float AshtekRoll(time) ;
AshtekRoll:long_name = "Ashtek roll" ;
AshtekRoll:units = "degrees" ;
AshtekRoll:_FillValue = -99999.f ;
AshtekRoll:type = "Data" ;
float HRPHeave(time) ;
HRPHeave:long_name = "HRP Heave" ;
HRPHeave:units = "millivolts" ;
HRPHeave:_FillValue = -99999.f ;
HRPHeave:type = "Data" ;
// global attributes:
:Instrument = "NOAA - Shipboard" ;
:DataType = "Navigation" ;
:Data Mentor = "M.J. Post" ;
:Organization = "ETL" ;
:Email = "mpost@etl.noaa.gov" ;
:Phone = "303-497-6048" ;
:Disclaimer = "Although most of these data have been screened for certain errors by quality control checks, problems and errors may still remain; ETL does not guarantee their accuracy" ;
:History = "File Creation: 1997-03-31 22:01:28" ;
:First_Record_Time = "1996-03-26 00:00:00" ;
:Last_Record_Time = "1996-03-26 23:48:20" ;
}