2015-04-01
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Calls from ship to shore require a coast earth station (CES) ID number, followed by a service code, country code, area code and telephone or telex number.
Coast earth stations use two digit ID codes for SAT-A and three digit ID codes for SAT-C, В and M.
To facilitate sending an automatic distress (red button), some satellite equipment require an ocean region and coast earth station be designated immediately at turn-on (logging-on). Obviously the satellite and coast earth station should be in your ocean region. In some cases you also have to specify an RCC. Make sure you update this during the voyage if you change ocean regions. If the wrong ocean region is entered, the distress call may be routed to the wrong RCC, which will delay the response. All distress and safety traffic receives priority handling by INMARSAT and is routed by the CES to the regional RCC without cost.
SafetyNET
SafetyNet is a service of INMARSAT-C for receiving distress alerts and maritime safety information (MSI). Vessels operating beyond coastal NAVTEX coverage must have INMARSAT-C or HF NBDP telex to receive maritime safety information. SafetyNet, like NAVTEX, can be programmed by the ship's operator to accept or reject certain message categories.
SafetyNet is available only in SAT-C terminals with the Enhanced Group Call (EGC) feature. EGC is used for sending messages to groups of ships or to all ships within a specified region or NAVAREA. To receive SafetyNet broadcasts appropriate to your location or NAVAREA you must use the satellite serving your ocean region. This will ensure that you receive the MSI broadcasts for your NAVAREA. If you do not specify a satellite, the receiver will usually lock on to the highest visible satellite, which could be a problem in areas of overlapping coverage. You must also log-on to the system. In INMARSAT-C logging on is usually accomplished as soon as you specify the satellite. This tells the NCS that you are accepting traffic.
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NOTE: You must logout before turning your system off or the NCS will assume you were receiving messages while your system was off. When you next log-on again, you will receive the safety messages that are still in affect at the next broadcast.
To receive SafetyNet:
| 1. Use your own ocean region satellite (you must log-on). 2. Specify the NAVAREA you want (you can also request the next NAVAREA). 3. Indicate message categories to be rejected (same as NAVTEX). 4. Nav position must be updated (usually automatic). |
II. Put 15 special questions to the text.
III. Translate the following words and expressions from English into Russian
Standard satellite communications, the International Maritime Satellite system, the satellite (space) segment. international telecommunications network, analog (digital) system, EGC, omni-directional, coast earth station, log on / log out, SES.
IV. Translate the following sentences from Russian into English
1. В ГМССБ задействованы спутниковые и наземные системы связи.
2. ИНМАРСАТ основывается на использовании геостационарных спутников.
3. ИНМАРСАТ обеспечивает оповещение о бедствии, передаваемое с использованием судовой земной станции или спутникового аварийного радиобуя (АРБ) и возможность двусторонней связи с абонентом.
4. Космический сегмент, предоставляемый ИНМАРСАТ, - спутники, запущенные на геостационарную орбиту.
5. Спутники располагаются в определенных точках над Атлантическим, Индийским и Тихим океанами и обеспечивают почти глобальный охват поверхности Земли.
6. Наземный сегмент включает в себя глобальную сеть береговых земных станций и координирующих станций сети (Network Coordination Station).
7. Береговые земные станции (БЗС) обеспечивают линию связи между спутником и наземными сетями связи и одновременно могут представлять несколько каналов для связи с судовыми земными станциями.
8. Судовые земные станции – это терминалы связи, установленные на борту судна.
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9. Судовые земные станции предназначены для связи с береговыми абонентами через спутник и БЗС.
10. Связь береговых земных станций со спутником осуществляется через большую направленную антенну.
V. Complete the text with the words give below, translate and retell the text below
Satellite communications are particularly important elements of the____. The INMARSAT system employs ______ satellites and operates in the 1.5 – 1.6 GHz. It provides ships fitted with Ship Earth Stations (SES) a means of _____ and a capability of two-way communications using radio telex and radiotelephone.
The INMARSAT SafetyNET system is used for broadcasts of MSI to areas not covered by the ___ system.
The maritime satellite system has three major components: the ___ segments provided by INMARSAT, the Coast Earth Stations (CES) provided by INMARSAT signatories and SESs.
The INMARSAT system provides ships at sea with the same types and quality of modern communications as are available____. The nerve center of the system is the Operations Control Center (OCC) located at INMARSAT‘s headquarters in the United Kingdom. Four INMARSAT satellites in geostationary orbit 36,000 kilometers above the ____ provide near-global coverage. The coast earth stations CES provide the ____ between the satellites and terrestrial telecommunications networks.
