public async Task <IHttpActionResult> GetOrientation(int ID)
        {
            TrackerOrientationsHandler   TOH    = new TrackerOrientationsHandler(db);
            TrackerOrientation           TO     = TOH.GetTrackerOrientation(ID);
            KeyValuePair <DateTime, int> result = new KeyValuePair <DateTime, int>(TO.TimeStamp, TO.Orientation);

            return(Ok(result));
        }