code: function setPositionCallback(positionFunction){
  
      if (typeof(positionFunction) == 'function'){
  
          orientationCollector.setPositionCallback(positionFunction);
          callbacks.positionCallback = positionFunction;
  
      }
      else
          logger.warn('Trying to set a non function object as position callback');
  
  }
docs: Sets the function to call when setting position
  @memberof DataCollector
  @param {function} positionFunction