Training Center XML (TCX) is a data exchange format introduced in 2007 as part of Garmin's Training Center product. The XML is similar to GPX since it exchanges GPS tracks, but treats a track as an Activity rather than simply a series of GPS points.
Garmin's Training Center XML (TCX) was launched in 2007 as part of their Training Center software. This format allows for the exchange of GPS routes, but distinguishes between routes and events, treating each route as a single activity.