Nautical Courtesy Flag
When you drop your yellow quarantine flag, be ready to raise the appropriate colors in its place. Courtesy flags are normally 12x18 with mounting grommets.
Courtesy flags take on a larger dimension when you are the cruising guest of a foreign land. More than just a gesture, you may well find that you gain a little more time on your visa to stay and enjoy when the local Customs department observes your etiquette.