A recent GPS track was way off and not in an "it's on the wrong side of the street" manner. More like, the whole track was shifted 6.5 miles to the SW and the length was listed as 2.12 miles instead of the 1.5 miles when the track for the same walk recorded correctly. The track shows up in the incorrect location on Google Maps on my phone and in Google Earth with both a downloaded .kml and downloaded .gpx.