[Bash]

the combination of ensign and courtesy flag is not just good form, it is indeed a legal requirement. (On a boat, the flag of the country of origin is properly called an "ensign.")

realize that when you are in sight of land arriving at the Bahamas you must fly the Q flag until you clear in. Once you have cleared you fly the courtesy flag in place of Q. It lets the authorities know that you are in the country properly and that you agree to abide by their laws.