https://padlet.com/robdin00/lx8c1fcnbxm8 Created by Roberto D'Intino en-us 2019-01-08 17:48:16 UTC 2026-03-17 07:40:59 UTC hello@padlet.com robdin00 https://padlet.com/robdin00/lx8c1fcnbxm8/wish/318455342 -Global Maritime Distress and Safety.
It is designed to ensure the transmission of maritime distress and safety communications in the world.

-IMO devolped the GMDSS. It became operarional in '99.

-GMDSS uses message in Morse Code using radiotelegraphy.

-GMDSS is based on a combination of satellite, so shadow areas can't be during the transmission.


]]> 2019-01-08 17:56:07 UTC https://padlet.com/robdin00/lx8c1fcnbxm8/wish/318455342 robdin00 https://padlet.com/robdin00/lx8c1fcnbxm8/wish/318461675 -International Maritime Satellite Organization.

-It was established in '79, and in '99 has become a private company.

-It provides a global satellite service to marittime, areonautical and some service of voice communications.

-Nowdays there are 11 operating satellites in a distance of 38.000Km above the Equator.

-These satellites can cover one third of the Earth.

-The signals sended by satellites are recived by Land Earth Stations.

-The Italian LES is located in Abruzzo, on the Fucino.]]> 2019-01-08 18:06:07 UTC https://padlet.com/robdin00/lx8c1fcnbxm8/wish/318461675 robdin00 https://padlet.com/robdin00/lx8c1fcnbxm8/wish/318467867 -Since February 1st, '99 all passenger ships, and Cargo ships of 300 GT, must carry a number of different radio systems for transmetting distress and safety alarm.

These systems are:
1) Radio installation, that can transimt using radiotelephony and DSC;
2) SART, one if under 500 GT and two if over 500GT;
3) Portable VHF transceives, two if under 500 GT and three if over 500 GT;
4) NAVTEX receiver;
5) Inmarsat EGC reciver;
6) 406 MHz EPIRB

]]> 2019-01-08 18:15:32 UTC https://padlet.com/robdin00/lx8c1fcnbxm8/wish/318467867 robdin00 https://padlet.com/robdin00/lx8c1fcnbxm8/wish/318475674 -It is a digital communication system that supports data transmission, but it doesn't support voice transmission.

-It is a computer with a small unit and fixed antenna.

-It offers different services like:
1) EGC SafetyNET used by meteorilogical authorities for issuing warning.
It works with terminals that are cinnected with GPS, and it gives all positions in the world;
2) Distress Alerting Facility for sending ship-shore distress alerts by pressing a button.
It automatically send distress message with the position of the ship.


]]> 2019-01-08 18:27:08 UTC https://padlet.com/robdin00/lx8c1fcnbxm8/wish/318475674 robdin00 https://padlet.com/robdin00/lx8c1fcnbxm8/wish/318483356 These areas are:
1) Sea area A1. This is an area within 20 to 30 NM from the coast. All the ships must have VHF on board to transimt and receive distress alert;
2) Sea area A2. This is an area within 100 to 150 NM. All the ships must have MF radio on board to transimt and receive on Medium Frequencies for both voice and DSC;
3) Sea area A3. This is an area over 150 NM. In this area all the ships can transimt and receive distress and safety communications, initiating and receiving distress calls and maintaining watch for shore to ship distress alert;
4) Sea area A4. This area comprises the remaining sea areas, called polar regions. All ships must have a radio installation for long range alerting and high frequencies HF.


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