HEALTH DOCUMENTS AND FORMALITIES
HEALTH MEASURES ON ENTERING PORT
The captains or owners of vessels that make international journeys will announce their arrival at port in advance by phone or signals to the port's health authorities. When they come within vision, the corresponding flag of the International Signals Code is raised.
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At night, we can ask for health-care by placing a red light above a white one, separated by a maximum of two metres.
While the signals remain hoisted all communication with the vessel is prohibited except for pilots and tug boats; those vessels that are denied free talk cannot make contact with land or any other vessels, and must remain anchored or moored where the port authorities indicate.
The health authorities will solicit, should it be deemed necessary, the Maritime Declaration of Health, endorsed by the on board doctor, if there is one. This complies with the International Health Regulations, article 90. In this respect, the subsequent measures can be taken:

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The Free Talking Certificate is given to vessels after a Anterior inspection of the health conditions.

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HEALTH MEASURES WHILE REMAINING IN PORT
The captain or vessel owner, through annotations on the back of the free talking certificate, must take note, whilst in port, of any health incident that might occur on board; this includes any alteration in the health of the crewmembers, passengers and animals on board, such as a sudden large unexplained death of rats. No ill person may be transferred without written authorisation from the Health Authority.
Conversely, they must prevent the use of seawater for washing or domestic use as well as the dumping of on board residual materials and refuse. They should prohibit the use of seawater for hosing down in the proximity of sewage outlets.
HEALTH MEASURES ON LEAVING PORT
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In relation to the vessel, it should have Anteriorly obtained:
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The validity of the International Rat Clearing Certificate/ Rat Clearing Exemption Certificate, conforming with article 17 of the International Health Regulations, and the Insect Clearing Certificate, issued after Anterior verification of having carried out the required extermination of insects capable of transmitting diseases to man, should be checked.
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In relation to the crew:
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In relation to the voyage and companions:
No one who could be carrying an infectious disease is permitted on board, and if they are common infections, either the on board or local health personnel should authorise their isolation. Neither ill people nor corpses are permitted on board, without Anterior authorisation from the health authorities.
Companions of crewmembers can substitute the medical inspection for an ordinary medical certificate Anterior to departure, if the captain agrees.
In relation to the cargo:
A Health Inspection Certificate should be obtained (after Soliciting the Inspection) issued once the merchandise has been inspected under the import/export regime. This cannot be used in place of compulsory specific legal or regulatory forms.