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| M.540 : Operational and technical characteristics for an automated direct-printing telegraph system for promulgation of navigational and meteorological warnings and urgent information to ships | 
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| Recommendation M.540 |  
| Approved in 1990-06 |  
| Managed by R00-SG05 |  |  |  
| Main |  
| Number 
 | Title | Status | Questions |  
| M.540-2 (06/90) 
 | Operational and technical characteristics for an automated direct-printing telegraph system for promulgation of navigational and meteorological warnings and urgent information to ships | In force (Main) 
 | N/A |  |