The Yellow Jack ("Quebec") signal flag, is a plain yellow banner that was historically used to signify a vessel was, or might be, harboring a dangerous disease and needed to be quarantined (the flag represents the letter “Q”). A ship flying two Quebecs ("QQ"), or "Double Quebec", is signaling: "I require health clearance." In both cases, if and when free pratique is granted, the vessel may lower the Quebec(s), raise the national ensign of the port, and do business there.
The Yellow Jack ("Quebec") signal flag, is a plain yellow banner that was historically used to signify a vessel was, or might be, harboring a dangerous disease and needed to be quarantined (the flag represents the letter “Q”). A ship flying two Quebecs ("QQ"), or "Double Quebec", is signaling: "I require health clearance." In both cases, if and when free pratique is granted, the vessel may lower the Quebec(s), raise the national ensign of the port, and do business there.
Source: Wikipedia "Yellow Jack (flag)" · CC BY-SA 4.0
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