Only remote surveillance
							                                
                                        
                                    
							                        
                    
                            A responsible person on board
							                                
                                        
                                    
							                        
                    
                            Automated security announcements
							                                
                                        
                                    
							                        
                    
                            No supervision needed
							                                
                                        
                                    
							                        
                     
	 
	