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What this format is

Puts several activities in one GPX file, each as its own track. Useful when a device split a long day into pieces.

How to get the file

  1. From Garmin Connect
  2. 1. Export each activity as GPX or FIT, then drop them together.
  1. From Strava
  2. 1. Export each activity, or convert a bulk zip first and pick the files you want.

What is kept and what is lost

KeptLost or missing
All points, names, and sensor data from each fileOriginal separate files — download those before you merge if you still need them