11.5.1 Each unit while stationary at the site,
                           including when engaged in drilling operations, should comply with
                           all requirements prescribed in chapter IV of the 1988 SOLAS amendments
                           that are 'applicable to a ship sailing through the same area.footnote
                           
                        
                        
                        
                      
                     
                     
                     
                        
                        
                         
                           11.5.2 Taking into account the different types
                           of accident which may occur on the MODU, additional radio equipment
                           should be installed in a room or position, which could be the bridge
                           or an emergency control room, situated as far as practicable from
                           the radio equipment fitted in compliance with section 11.5.1, so that
                           no single accident in any part of the MODU could deprive the MODU
                           of all facilities for radiocommunications.
                        
                        
                        
                        
                        The additional radio equipment should comply with the following
                           regulations for the 1988 SOLAS amendment for MODUs drilling in:
                        
                        
                        
                        
                           - 
                              
                              
                              
                                 .1 sea area A1, the equipment prescribed by regulation
                                 IV/7.1.1
                               
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                                 .2 sea area A2, the equipment prescribed by regulation
                                 IV/7.1.1 and IV/9.1.1;
                               
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                                 .3 sea area A3, the equipment prescribed by regulations
                                 lV/7.1.1 and lV/10.1.1, plus 10.1.2; or alternatively, as required
                                 by regulations IV/7.1.1 and 10.2.1;
                               
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                                 .4 sea area A4, the equipment prescribed by regulations
                                 IV/7.1.1 and IV/10.2.1.
                               
 
                     
                     
                     
                        
                        
                         
                           11.5.3 If the acoustic noise level in a room fitted
                           with operating controls for radio equipment is so high or could be
                           so high, during particular operating conditions, that it may disturb
                           or prevent proper use of the radio equipment, then adequate noise
                           protection should be provided by mechanical or other means, in association
                           with the operating controls for the radio equipment.