Subelement A: General Information and System Overview.— Topic :
Question 2A1
Element 7R (GMDSS-RO)Which GMDSS system utilizes terrestrial radio techniques?
Explanation
The Global Maritime Distress and Safety System (GMDSS) integrates various communication technologies. Terrestrial radio techniques involve transmission and reception between stations on Earth's surface, without relying on satellites as relays.
VHF-MF-HF-DSC (Very High Frequency, Medium Frequency, High Frequency Digital Selective Calling) represents the terrestrial components of GMDSS. VHF provides short-range, line-of-sight communication. MF extends range using ground waves, and HF allows for long-distance skywave communication via the ionosphere. All these utilize land-based coast stations or ship-to-ship transmissions. DSC is the signaling method used on these bands for automated distress alerting and routine calls.
Conversely, Inmarsat-C is a satellite communication system. GPS (Global Positioning System) is a satellite-based navigation system, providing position data. Neither of these utilizes purely terrestrial radio techniques. "F-77" is not a recognized GMDSS system.
Related Questions
29E5 Which is NOT a valid maintenance and testing function for a SART?29E6 The SART is required to have sufficient battery capacity to operate in the stand-by mode for what period of time?2A2 What equipment utilizes satellite communications?2A3 What equipment is used in or near the survival craft?2A4 What equipment is programmed to initiate transmission of Distress alerts and calls to individual stations?