Practice file for the three GPX checks in "Export an Apple Watch workout as GPX".

synthetic-track.gpx  Hand-written GPX 1.1 track: 7 track points along the equator in open
ocean, one every 25 seconds from 2026-10-12T07:00:00Z. Passed XML parsing and offline GPX 1.1 schema validation. It is NOT a WorkoutPort export and was not uploaded.
Use it to practise the checks: extension, <trkpt> lat/lon count, a <time> in each point.

Editorial validation: the supplied GPX files passed offline XSD validation on 20 October 2026. This checks file structure, not provider acceptance or real recording provenance.