SummitGPX Help CentreUnderstanding GPX
GPX versions and extensions
Understand format versions and extra data in route files.
GPX 1.0 and GPX 1.1 are file-format versions. They are different from SummitGPX route versions, which record changes to your course over time.
What extensions contain
Extensions hold extra information such as sensor readings or app-specific data. These fields are usually unnecessary for sharing a race course. The important parts are usable positions, the intended line, elevation and meaningful locations.
SummitGPX downloads
SummitGPX builds route downloads from its processed route data. Do not assume a downloaded file is a byte-for-byte copy of an uploaded activity or that it retains heart rate, cadence and every custom extension. KML and FIT imports are converted into GPX route data.
If a file causes problems
Export a clean course or track from the source planner and use Health Check to inspect it. Renaming the extension or manually changing the GPX version text is not a reliable conversion.