This schema defines Garmin extensions to be used with the GPX 1.1 schema. The root element defined by this schema is intended to be used as a child element of the "extensions" elements in the wpt/rte/trk elements in the GPX 1.1 schema. The GPX 1.1 schema is available at http://www.topografix.com/GPX/1/1/gpx.xsd. Id corresponds to the Adventure defined using the Adventure schema This type provides the ability to extend any data type that includes it.