Should I use GPX or FIT?

FIT is the richer file, on Garmin and elsewhere. It began as Garmin's format and is still their native one, but it has become the format head units share. Your stops arrive as typed course points with their own icons, and the file carries the route's total climb and descent, so the device can show you what is coming before you set off. Garmin takes it through Garmin Connect, Wahoo's app imports it, and most other head units take it too. Every platform reads GPX without exception, so it is the right choice for a Hammerhead Karoo (which rejects routes sent as FIT), or anywhere a device or app turns a FIT file down; stops travel as waypoints.

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