<?xml version="1.0" encoding="UTF-8"?>
<gpx version="1.1" creator="test" xmlns="http://www.topografix.com/GPX/1/1">

  <trk><trkseg>
    <trkpt lat="47.3760" lon="8.5410"><ele>408</ele></trkpt>
    <trkpt lat="47.3800" lon="8.5470"><ele>NaN</ele></trkpt>
    <trkpt lat="47.3850" lon="8.5520"><ele>abc</ele></trkpt>
    <trkpt lat="47.3900" lon="8.5580"><ele>512</ele></trkpt>
  </trkseg></trk>
</gpx>
