■ GMDSS (Video)

Please click on the below link,,,

http://www.youtube.com/watch?v=EQgZ5nINrII

■ GMDSS telecommunications

MAYDAY
DISTRESS
PANPAN
SECURITE


Please click on the below link

https://www.youtube.com/watch?v=-QfiNSBkGnc

■ GMDSS (MP3)

Please click on the below link

http://www.youtube.com/watch?v=QOa6_jF8dcs

■ Marine Communication System

Please click on the below link


http://www.youtube.com/watch?v=8dCfJZ9r2-E&feature=PlayList&p=3BE1B89C618A74DC&playnext=1&playnext_from=PL&index=7


from ICS

■ Linghtning protection measures (Antenna & ship eletronics)

Lightning strikes are capable of causing costly damage to almost all ship electronics. While direct strikes are uncommon, nearby strikes commonly cause power surges that destroy unprotected electronics. If ship is not sailing high-risk area(the Southern Red Sea, Gulf of Aden and Western Indian Ocean), The best protection for your electronic equipment is to unplug power sources of GMDSS equipment(particularly, Inmarsat-C, MF/HF radio, Weather FAX) of being easy to break--during a lightning storm. This best practice isn't always possible, so you should conduct regular check up all antenna and grounding condition to protect them from damaging lightening strikes

Responsible officer(2nd officer) should check antennas of the following

Antennas (SR inspection)
a. Visual inspection of all antenns, including INMARSAT antennas, and feeders for satisfactory
    siting and defects
b. Checked that arrangements are provided enabling MF/HF transmitting antennas to be grounded
c. Checked that the MF/HF transmitting antennas are protected against being touched accidentally

Monthly
■ check antenna connection and corrosion state

Every 6 months
■ check antenna earth link copper plate and earth cable  including earth bolt
■ check all parts of antennas(grounding condition)

■ Earthing (Lightning protection)

Earthing

Earthing of radio equipment should be carried out in accordance with appropriate guidelines
for Earthing in Maritime Installations required in international standards.
Great care should be taken in order to fulfil the following rules:
1. Each unit of radio equipment should have a separated earth connection.
2. MF/HF antenna tuners should be earthed with either a copper bar or copper band.
3. The earthing bar or strap should be as short as possible, should not be more than
    one metre in length, and should be at least 60 mm in width.
4. For earthing straps up to 5 metres in length the width should be at least 100 mm
    (May be relevant on board vessels made of wood or synthetic materials).
5. It should be noted that a long earthing strap or bar will act as an antenna and
    radiate energy.
6. Copper bars and straps should be brazed to the steel bulkhead in order to
    eliminate corrosion and vibration and make a good earth connection.
7. Great care should be taken when earthing radio equipment on ships with
    aluminium superstructures in order to avoid galvanic corrosion. An approved and
    acceptable method of earthing should be used on such ships.

A properly installed lightning protection system consists of copper plate or earth cable
that terminate a lightning strikes, and then carry the current safely to the sea through the body of ship

■ Typical GMDSS installations for ships in international voyages (Area A3)