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 trkpt element in the GPX 1.1 schema. The GPX 1.1 schema is available at http://www.topografix.com/GPX/1/1/gpx.xsd. This type contains data fields that cannot be represented in track points in GPX 1.1 instances. This type contains data fields for acceleration. Time offset from the time of the track point measured in milliseconds. Horizonal acceleration value measured in acceleration due to gravity or g. Vertical acceleration value measured in acceleration due to gravity or g. Depth acceleration value measured in acceleration due to gravity or g.