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This is the GpxTcxWelder project ("gpxtcxwelder")
This project was registered on SourceForge.net on Jan 30, 2011, and is described by the project team as follows:
Substitutes the missing GPS information in Garmin TCX files when devices lacking a GPS receiver are used to collect training data (Garmin FR 60, heartrate and pedometer only). GpxTcxWelder integrates GPS info from a GPX v1.1 files into TCX files
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