GMDSS Radio Survey Blog


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Studying the MF/HF radio stations. Their role in GMDSS, main requirements to installation and survey

Category: GMDSS Radio

MF/HF radio station is a high tech equipment, designed for receiving and transmitting messages between vessels in the medium and high frequency range. It usually consists of a transceiver, a control block, and an antenna.

For any vessel crossing oceans and seas as well as for those working offshore, an MF/HF radio is an indispensable section of equipment, it ensures long-distance radio communication. MF/HF radio is an important part of GMDSS, that’s why most of the vessels are obliged to install it in accordance to international safety regulations.

MF/HF on board the ship provides radiotelephony, narrow-band direct printing and DSC over long distances. An MF/HF radio installation with DSC should be installed with a TELEX terminal. The system is subject to mandatory annual GMDSS survey.



The MF/HF/VHF radio stations with DSC (Digital Selective Calling) are an essential component of modern communication systems operating within the GMDSS.

DSC is used for initial calling of ship and shore stations for the purpose of further communication by ...



Marine communication has long history and continues developing to this day. For the last years this field have been changed and innovated greatly. 

At the first stages of its evolution semaphores and flags were used, later mariners began using radio for transmitting distress ...


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The NAVTEX system provides the automatic dissemination of local Maritime Safety Information (MSI) by Narrow Band Direct Printing (NBDP) operating in the Forward Error Correction (FEC) broadcast mode (see Section 0 for more details on FEC operation). Depending on the geographical features of its ...



Portable two way VHF radiotelephone equipment is used for communications between survival craft and rescue vessels. It may also be used for onboard communications on channels 15 and 17. Newer models automatically reduce the power to 1 W when these channels are selected. The equipment typically ...


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