How to send a message (telex) to a ship on the high seas

For example, you want to congratulate your friend Roman on his birthday, and he is fishing. You do not know the number of the terminal installed on his yacht , but here the INMARSAT directory will help us out - it has all the ships equipped with telex terminals (Russian names need to be written in transliteration). There was a lot of things, but we are interested in the number, after which it is written [Inmarsat C Text / Data]. It remains to think of which of the 4 INMARSAT prefixes should be indicated before the number. If you know the navigation area, then you need to use 581 for the East Atlantic, 584 for the Western, 582 for the Pacific Ocean, and 583 for the Indian. If the area is unknown, you can iterate through all 4 prefixes sequentially - one of the messages will definitely reach, and for undelivered messages, the money will not be collected (more precisely, they will be returned to your account after an unsuccessful attempt).

www.napishi.ru/telex.asp