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Yellow Jack: Lima flag (L) for ship in quarantine instead of Quebec flag (Q)
#1
Exclamation 
Referring the picture in the power point presentation of this FIRST lecture on 5th Jan 2018 ...
[Image: former-Quarantane-flag.jpg] 
... we need to make something clear to avoid misunderstanding: to set the yellow flag "Q" (Quebec) does NOT show a sailing yacht or ship in quarantine in our times anymore. 

Yes, its right... in the past history - before effective treatments for diseases such as cholera, malaria, and yellow fever - ships transporting ill persons remained in quarantine off-shore.  
The term "quarantine" itself is derived from the practice of the city-state of Venice during the Middle Ages of requiring ships arriving from locations known to being experiencing diseases such as the plague to anchor or moor off the port for 40 days (quaranta giorni) so that any disease on board might run its course.  

The concept of protecting the public health by restricting the movements of individuals who are suspected of possibly harboring serious disease has remained constant. But: the practice of quarantine has varied over the centuries. 

The ships flew a "yellow flag" - see following picture - to indicate that no one could depart or come aboard. Also green and even black flags have been used to symbolize disease in both ships and ports, with the color yellow having a longer historical precedent, as a color of marking for houses of infection, previous to its use as a maritime marking color for disease.
[Image: PL20_0.jpg]

But clearly it is stated since many years in the official IMO book "International Code of Signal" that this has changed (Rec.: Revised version 2003 of US edition Pub 102, see pdf attachment). Nowadays a ship must use the flag "Lima" (L).
[Image: International-Code-of-Signals-flags.png]
This quarantine flag, also called the “Yellow Jack”, is the international signal flag LIMA. It is square in shape. Its display is divided into four smaller squares, with two on top and two on the bottom. The smaller squares are alternately yellow and black in color. You can memorize it, as same colours are used on land:
 
[Image: caution-nquarantine-no-admittance.png]    [Image: Internatinal-Code-Signal-Lima.png]

The flag LIMA is flown from a ship that is either arriving in port with known serious health problems or that has been placed under quarantine by the local port authorities.  

Once the local authorities have determined that the ship’s health problems have been resolved and removed the quarantine order, the ship may fly the free pratique flag = the international signal flag QUEBEC, which is solid yellow. 

The phonetic pronunciation is "keh-BECK", see official table in the IMO book:
 
[Image: Phonetic-Alphabet.png] 

Remember: Use only the "yellow Flag Q" (Quebec) if you can convince the authorities when entering a port that your ship is free from contagious disease. The clearance granted is commonly referred to as "Free Pratique".

In the IMO book for International code of Signals (see attachment) you find a fully chapter no. 3 for medical issues: 
  • SECTION 1: EXPLANATION AND INSTRUCTIONS, e.g. Standard method of Case description
  • SECTION 2: REQUEST FOR MEDICAL ASSISTANCE, e.g. LOCALIZATION OF SYMPTOMS, DISEASES, OR INJURIES
  • SECTION 3: MEDICAL ADVICE 
  • SECTION 4: TABLES OF COMPLEMENTS, e.g. LIST OF COMMON DISEASES
You can buy the latest IMO edition 2005 for ~49 British pounds online (also available as ebook).


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