 
                                    
                            Use damaged charts if they're clean
							                                
                                        
                                    
							                        
                    
                            Carry enough approved charts
							                                
                                        
                                    
							                        
                    
                            Reuse charts twice
							                                
                                        
                                    
							                        
                    
                            Use dirty charts if they're undamaged
							                                
                                        
                                    
							                        
                     
	 
	