GMDSS GMDSS is an enhanced Search And Rescue (SAR) system using automation and advanced satellite and HFIMFNHF radio communication technology.

The System is a combination of:-

Satellite communications;

MF/HFNHF Radiotelephony ;

Radiotelex (Direct Printing Telegraphy); Survival Craft Radar Transponders (SARTs); Satellite EPIRBs;

Data transmission ; and

Digital Selective Calling (DSC). Some companies are manufacturing the full range ofGMDSS equipment to be accessedfrom one keyboard and one VDU (screen).