part of exported tracklog is repeated

[ethoms]

Hello there,
I use a Canmore USB thumbdrive data logger (GT-730FL-S) with GPS
Babel. I wrote the python script below for extraction:
(the main thing to notice is the switches)

It works fine except that the tracklogs always have a section that is
repeated. For example, in a particular gpx file, the vertices from
1530 ~ 2038 are exactly the same as the vertices from ~ 1020 ~ 1529.

Can anyone suggest what might be going on here?

Thanks
Evan

I can send a gpx or kml file; I just thought not to clog the pipe
unless someone wants to see it.

*****************************
import os
import time


path = r'C:\Workspace\misc\GPStracks'

kmlname = time.strftime("%b_%d_%y.kml", time.localtime())
gpxname = time.strftime("%b_%d_%y.gpx", time.localtime())
csvname = time.strftime("%b_%d_%y.csv", time.localtime())

gpxpath = os.path.join(path, gpxname)
kmlpath = os.path.join(path, kmlname)
csvpath = os.path.join(path, csvname)

switches = []
switches.append('gpsbabel')
switches.append('-t')
switches.append('-i
skytraq,erase,baud=0,initbaud=4800,read-at-once=0,first-sector=0')
switches.append('-f COM3')
switches.append('-o kml,lines,trackdata,labels')
switches.append('-F ' + kmlpath)
switches.append('-o gpx,lines,trackdata,labels')
switches.append('-F ' + gpxpath)
#switches.append('-o csv,lines,trackdata,labels')
#switches.append('-F ' + csvpath)

print 'Calling gpsbabel'
os.system(' '.join(switches))
print 'Opening ', kmlpath
os.system(kmlpath)
***********************************************************

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