GMDSS Radio Survey Blog

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Help Desk Service - first aid for your devices

Category: General

We launched a new service - Help Desk. You can find it in Support section on our web-site.

This is a place where you can ask a technical question directly to our engineers. 

If you faced any issue in your device’s operationand need support, our specialists will help you.


GMDSS Blog: category General

Iridium became a part of GMDSS. How will radio surveys change now?

Category: General

The monopoly of Inmarsat, which has been the only provider of satellite GMDSS services since 1999, is over. In early 2020, Iridium was successfully certified by the IMO. Thus, Iridium GMDSS has become a superior alternative to Inmarsat GMDSS; it covers all GMDSS Sea Areas from A1 to A4 and offers built-in Safety Voice Service. 

Iridium is a global mobile satellite communications system that covers 100% of the Earth's surface, including both poles. It provides real-time voice and data transmitting at sea, in the air, and on the ground. The system enables connection in remote areas which are not provided with traditional land-based communications, and in emergency situations.

The first-generation of Iridium's constellation was deployed in 1997-2002. The technology and most of the funding was provided by Motorola. To get 77 satellites into orbit, Iridium used rockets from the United States, Russia, and China.

Iridium NEXT and Iridium Certus. In 2017-2019, Iridium Communications Inc. launched 75 satellites of the second-generation Iridium NEXT: 66 active and 9 backup ones. They are cross-linked and located in Low-Earth Orbit (LEO) at an altitude of 780 km. New satellites were built by Thales Alenia Space and Orbital ATK and launched by Falcon-9 rockets of SpaceX.



1. For a long time, our company was known as “Musson Marine”. In 2015, after restructuring, we changed the name to Aeromarine ...


GMDSS Multi Software version 5.4.2. provides the possibility of generating report of any GMDSS equipment tested using your company ...


The protection of human life at sea has reached a new level over the past three decades, - since 1992, the phased implementation of the ...


"History The lucky yachtsman" On 5 January 1997 the single-handed Tony Bullimore’s yacht participating in around-the-globe race ...

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GMDSS Blog: category EPIRB

Evolution of EPIRB Testers

Category: EPIRB

The phased implementation of the GMDSS began with the mandatory equipping of vessels with satellite beacons. Its introduction made it necessary to manufacture EPIRB testers.

IMO required the inspection of emergency beacons to be mandatory. According to its requirements, EPIRB testers must provide accurate measurement of the parameters and performance of the emergency beacon in volume of:

Annual testing of 406 MHz satellite EPIRBs (Resolution MSC.1/Circ.1040/Rev.1 Revised Guidelines on annual testing of 406 MHz satellite EPIRBs adopted on 25 May 2012);

Shore-based maintenance of satellite EPIRBs (Resolution MSC/Circ.1039 Guidelines for shore-based maintenance of satellite EPIRBs adopted on 28 May 2002).




Now only EPIRBs with GNSS function are approved for sale. Seafaring was always connected with certain dangers. Since the Titanic all ...


Emergency positioning beacons are one of the most important equipment on board. In case something goes wrong, one of them is of great ...

Our customers and friends know that this year we presented the new great multifunctional tester MRTS-7M that provides testing of AIS, ...

This video illustrates the procedure of inspection of an emergency positioning indicating radio beacon (EPIRB) operating via ...

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GMDSS Blog: category AIS

Evolution of AIS Testers

Category: AIS

According to SOLAS Chapter V Regulation 18.9, the automatic identification systems (AIS) must be tested annually: “The test shall be conducted by an approved surveyor or an approved testing or servicing facility. The test shall verify the correct programming of the ship static information, correct data exchange with connected sensors as well as verifying the radio performance by radio frequency measurement and on-air test using, e.g., a Vessel Traffic Service (VTS). A copy of the test report shall be retained on board the ship”.

In our historical review, you will find out what the first AIS testers were like, what they were able to do, and what are the features of modern AIS testers. However, the singular is more suitable here, since there is only one tester with such a narrow specialization in today's market. 



An essential maritime safety tool Automatic Identification System (AIS) serves for exchange of real-time safety and navigation information ...

You may be a young surveyor, starting your marine survey career, or a highly experienced inspector remembering first Futronic tester. ...


SOLAS Chapter V, Regulation 18.9 states: “The automatic identification system (AIS) shall be subjected to an annual test. The test ...


These ‘MSLS’ or ‘MOB’ devices and systems are intended for very short-range crew retrieval applications. The MSLS ...

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GMDSS Blog: category GMDSS Radio

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 ...


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


The NAVTEX system provides the automatic dissemination of local Maritime Safety Information (MSI) by Narrow Band Direct Printing (NBDP) ...


Portable two way VHF radiotelephone equipment is used for communications between survival craft and rescue vessels. It may also be used for ...

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GMDSS Blog: category SART

Evolution of SART Testers

Category: SART

The search and rescue radar transponder (SART) is an important part of the GMDSS intended for locating ship or survival craft at sea when it is in distress. 

SART is a small, battery powered, omni-directional radar receiver and transmitter, it can be detected by ship or aircraft radars operating in the frequency band 9.2-9.5 GHz. On receiving a signal from the radar, the device transmits a series of response signals. These signals will be seen on radar screen as a line of 12 dots extending approximately 8 nautical miles away from the SART’s position along its line of bearing. This unique radar signal is easily recognised and allows the rescue vessel or aircraft to locate the survival craft. 

The carriage of the SART on board ships is mandatory, according to IMO requirements. IMO also requires that SART, as a part of the GMDSS, be regularly tested. If the radio survey reveals a malfunction, the vessel may be detained at port.



The Search and Rescue Radar Transponder as a part of GMDSS is a subject to annual test during radio survey. The annual testing of ...


Since 1 January 2010, AIS – Search and Rescue Transmitters can be carried in lieu of Search and Rescue Radar Transponders on vessels ...


Search and rescue radar Transponders (SARTs) are the main means in the GMDSS for locating ships in distress or their survival craft, and ...

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