public int WatchPosition(PositionCallback successCallback, PositionErrorCallback errorCallback, PositionOptions options)
 {
     return(0);
 }
 public int WatchPosition(PositionCallback successCallback, PositionErrorCallback errorCallback, PositionOptions options)
 {
     return 0;
 }
 public void GetCurrentPosition(PositionCallback successCallback, PositionErrorCallback errorCallback, PositionOptions options)
 {
 }
 public void GetCurrentPosition(PositionCallback successCallback, PositionErrorCallback errorCallback, PositionOptions options)
 {
 }