■ 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)