Flag Etiquette | Regulations | Information & Advice | RYA
"More than one flag may be flown on a halyard except that flag etiquette states that no flag can be above the burgee on the same halyard and no flag can be worn above the courtesy flag. If you fly a burgee at the starboard spreaders and are sailing in the territorial waters of another country this presents something of a dilemma
, particularly if you must fly a burgee to match a special Ensign. Unless the burgee is in its traditional position at the masthead, you risk flouting one or another element of flag etiquette. How you choose to resolve this is a matter of choice."
I know how I'd solve THAT dilemma!