Domain model representing a single waypoint (GPS point) in a track.
Elevation of the waypoint, can be null (so we can interpolate later)
Unique identifier for the waypoint (Double is unusual, usually Int or Long is used).
Latitude coordinate of the waypoint.
Longitude coordinate of the waypoint.
Foreign key reference to the track this waypoint belongs to.
Converts a domain Waypoint object into a database WaypointEntity.