About GPS tracks

The GPS positioning system have made a large difference for tracking training activities.

Web browser GPS visualiser

This is a visualisation tool of GPS files that is run in the web browser.

The GPS tracks reader

The start 2007

gps visualize

Hans' radio-orienteering friend Rolf Svensson started it; tracking the path during a radio-orienteering competition. And, since Hans got a GPS unit for his 50th birthday in 2007 he started to use it also.

A great way to inspect the tracks is by uploading them to GPS Visualizer.

Another alternative is comparetracks.com. See the radio-orienteering night race of Hans, Jan and Rolf, August 2008 in Eskilstuna:

geotag logo 2008-08-11 Vilsta

GPS units and file formats

Hans first GPS; Garmin eTrex Venture® Cx, had the capability of saving the track data as GPX files directly.

The second GPS; Garmin Forerunner ® 405, did not stored the tracks in GPX format but the TCX format, which is basically a GPX file with added information like heart rate and distance.

One month in 2017

This calendar shows the GPS-tracks that Hans created in May 2017.

Calendar

Track animations

With the track files and map data it is possible to create animations of the path.

Here are some animations of GPX track files.

Sport events

2009-05-29: filmRadio-orienteering, Lindesberg, 3,5 MHz

2014-02-21: filmKortvasan 30 km, Mora

Recreation events

2014-02-21: filmTorpedo boat HMS Spica T121, Stockholm

Difference between the GPX and TCX file format

GPX and TCX are both XML file formats. Both contain GPS waypoints, tracks, routes, etc.

GPX is an open format, free for development use without licenses.

TCX is a proprietary format developed by Garmin. It allows additional information such as heart beat and cadence.

A trackpoint from a GPX file

<trkpt lat="59.6500974" lon="16.5200726">
   <ele>39.5512695</ele>
   <time>2009-03-21T07:14:50Z</time>
</trkpt>

The same trackpoint from a TCX file

<Trackpoint>
   <Time>2009-03-21T07:14:50Z</Time>
   <Position>
      <LatitudeDegrees>59.6500974</LatitudeDegrees>
      <LongitudeDegrees>16.5200726</LongitudeDegrees>
   </Position>
   <AltitudeMeters>39.5512695</AltitudeMeters>
   <DistanceMeters>1534.3891602</DistanceMeters>
   <HeartRateBpm xsi:type="HeartRateInBeatsPerMinute_t">
      <Value>151</Value>
   </HeartRateBpm>
   <SensorState>Absent</SensorState>
   <Extensions>
      <TPX xmlns="http://www.garmin.com/xmlschemas/
      ActivityExtension/v2" CadenceSensor="Footpod"/>
   </Extensions>
</Trackpoint>

FIT file format

Online converter from FIT to TCX: http://fit2tcx.runalyze.de/

Data FIT TCX GPX
GPS position yes yes yes
Heartrate yes yes
Cadence yes yes
Speed yes yes yes
Distance yes yes yes
Power yes yes
Temperature yes
Heart rate variability yes
Pool Swim yes
Open Water yes yes
Weather Conditions yes