Step by Step instructions to extract GPS track data from a Canmore GT-730GL-S USB GPS Datalogger using GPSBabel.
The command line used to correct the altitude data is:
"c:\Program Files (x86)\GPSBabel\gpsbabel.exe" -i gpx -f INPUT.gpx -x height,wgs84tomsl -o gpx -F OUTPUT.gpx
The command line used to correct the altitude data is:
"c:\Program Files (x86)\GPSBabel\gpsbabel.exe" -i gpx -f INPUT.gpx -x height,wgs84tomsl -o gpx -F OUTPUT.gpx
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GPS Babel front end screen with all settings. Make sure to select an output file. -
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SkyTraq input settings. These settings will NOT erase the tracks in the GPS unit. -
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These are the default settings for GPX XML output. -
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Filter Settings will create separate tracks by date. I figure I don't plan on flying my planes very often at midnight. :-) -
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After clicking apply, you see the command line that was executed and the results. -
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Open a command window in the directory containing your GPX files and run this command. From the docs: "This option subtracts the WGS84 geoid height from every altitude." I find this is accurate for me so far. -
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Load the height corrected GPX file into GPX Editor and you see the separate tracks for each day.


