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gpsbabel -t -i gpx -f tiedosto.gpx -x track,start=200608270711,stop=200608270807 -o gpx -F uusitiedosto.gpx

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#! /bin/sh

# © 21 aug 06, Harald Hannelius

# this one reads a SeaTrace trt-file and spits out an GPX file

# Todo: the xml gpx-file doesn't have a <trk> or <trkseg> tag in it. Have to
# add that manually for now.

# Todo: The trt files are un-averaged. One should really do a
# moving average on the values before using them. Or just skip two of three lines?

if [ -z ${1} ] ; then
    echo give input file as arg1
    exit 1
else
    infile="${1}"
fi

newfile="`basename "$infile" .trt`.gpx"

gpsbabel -i xcsv,style=seatrace.style -f "$infile" -o gpx -F "$newfile"

cat $newfile | sed -e 's,<wpt,<trkpt,' -e 's,</wpt>,</trkpt>,' -e 's,<time,  <ele>0</ele>\n  <time,' > $newfile.tmp
mv $newfile.tmp $newfile
#sed -e 's,<wpt,<trkpt,' -e 's,</wpt>,</trkpt>,' 's,<time,<ele>0</ele>,<time,'

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# Style file for gpsbabel to read SeaClear's companion SeaTrace's TRT file.
#  7 Feb 06 Harald, first version

DESCRIPTION SeaTrace TRT format

#
COMMA   ,
FIELD_DELIMITER    COMMA
RECORD_DELIMITER    NEWLINE

# Look in the file seatrace.format for info on TRT files.
# first column i date (from computer)
#   20050907 15:08:12 CZ    # date, from computer!!
# second column is LAT as D.D
# third column is LON as D.D

#IFIELD YYYYMMDD_TIME,"","%ld"
IFIELD  GMT_TIME,"","%Y%m%d %H:%M:%S %Z"
IFIELD  LAT_DECIMAL,"","%f"
IFIELD  LON_DECIMAL,"","%f" 

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BEGIN{
  start=0;
  TR=-1;
  oldtime=-1000;
  FS=","
}
{
  if(match($0, "TP")!=0)
    {
      if($7==1)
        {
          TR++;
          start=1;
          i[TR]=0;
        }
      if(start==1 && $0!="")
        {
          STR[TR,i[TR]]=$0;
          i[TR]++;
        }
    }
}
END{
  maxTR=TR+1;
  for(TR=0; TR <= maxTR; TR++)
    {
      if(i[TR]>0)
        {
          for(j=0;j<i[TR];j++)
            {
              $0=STR[TR, j];
              print "res=1";
              gsub(":", "", $6);
              time=$6;
              h=substr(time,1,2);
              min=substr(time,3,2);
              sec=substr(time,5,2);
              timeh=h + min/60.0 + sec/3600.0;
              NorS="N";
              Ndeg=substr($3,0,3);
              Nmin=substr($3,4)*60.0;
              EorW="E";
              Edeg=substr($4,0,3);
              Emin=substr($4,4)*60.0;
              printf("$GPGGA,%d,%.3f,%c,%.3f,%c,1,06,1.0,0.0,M,-34.0,M,0.0,0000\n", time, Ndeg*100+Nmin, NorS, Edeg*100+Emin,EorW);
              COG=0.0;
              SOG=0.0;
              N=$3;
              E=$4;
              if((timeh-oldtimeh) < 0.2 && (timeh-oldtime) > 0.0001)
                {
                  if(((E-oldE)*(E-oldE))>1e-20)
                    COG=180/3.14159*atan2(N-oldN, (oldE-E)*cos(3.14159*N/180.0))-90.0;
                  else
                    {
                      if(N > oldN)
                        COG=0.0;
                      else
                        COG=180.0;
                    }
                  if(COG < 0.0)
                    {
                      COG+=360.0;
                    }
                  SOG=60.0*sqrt((E-oldE)*cos(3.14159*N/180.0)*(E-oldE)*cos(3.14159*N/180.0) + (N-oldN)*(N-oldN));
                  SOG/=(timeh-oldtimeh);
                }
              printf("$GPVTG,%.2f,T,,,%.2f,N,%.2f,K\n",COG,SOG,SOG*1.852);
              oldtimeh=timeh;
              oldN=N;
              oldE=E;
            }
        }
    }
}

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#! /bin/sh
# 3 jun 08 Harald, trunkating tracks to 500 points, make track-files, not wpt.
# © 21 aug 06, Harald Hannelius
if [ -z ${1} ] ; then
        echo give input file as arg1
        exit 1
else
        infile="${1}"
fi

# filter, 3s average
shorten="-x simplify,count=500"
title="-x track,title=Charlotta"

newfile="`basename "$infile" .trt`.gpx"

gpsbabel -t -i xcsv,style=seatrace.style -f "$infile" $shorten $title -o gpx -F "$newfile"

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# Style file for gpsbabel to read SeaClear's companion SeaTrace's TRT file.
#  3 jun 08 harald, added datatype so we can filter output using gpsbabel track-filters.
#  7 Feb 06 Harald, first version

DESCRIPTION     SeaTrace TRT format

DATATYPE        TRACK

#
COMMA   ,
FIELD_DELIMITER    COMMA
RECORD_DELIMITER    NEWLINE

# Look in the file seatrace.format for info on TRT files.
# first column i date (from computer)
#       20050907 15:08:12 CZ    # date, from computer!!
# second column is LAT as D.D
# third column is LON as D.D



#IFIELD YYYYMMDD_TIME,"","%ld"
IFIELD  GMT_TIME,"","%Y%m%d %H:%M:%S %Z"
IFIELD  LAT_DECIMAL,"","%f"
IFIELD  LON_DECIMAL,"","%f" 

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 sh gps2trt.sh 20080528.TRT

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gpsbabel -t -i gpx -f in.gpx -x track,start=2005072010,stop=2005072018 -o gpx -F out.gpx