The source information of the point, which can be either an object containing altitude, latitude, and longitude, or another Point instance.
The altitude of the point in meters.
The altitude of the point in meters.
The grade of the track at the point in percent.
The latitude of the point in decimal degrees.
The latitude of the point in decimal degrees.
The location of the point along the track in kilometers.
The longitude of the point in decimal degrees.
The longitude of the point in decimal degrees.
TrackPoint object for use in a track, with additional data (loc, grade)