As a sign of respect, it is appropriate to fly the flag of a foreign nation on your boat when you enter and operate on its waters. For those countries with two flags (both civil and government, such as Argentina and Costa Rica) only the civil fag should be used. Courtesy flags must only be hoisted after the appropriate local authorities have granted clearance. Until clearance is given, a boat must fly the yellow Q or quarantine flag.
Courtesy flags are flown at the boat's starboard spreader, whether the United States flag is at the stern staff, or flown from the leech. If you have more than one mast, the courtesy flag is flown from the starboard spreader of the forward mast.
Typically, courtesy flags are 12" x 18" and made of marine grade nylon, designed to withstand the damaging effects of sun, wind and salt water. They are finished with canvas heading and two rust-proof solid brass grommets. Our courtesy flags are made by Annin Flagmakers, the nation's oldest and largest flag manufacturer. Annin has produced flags since 1847.
Make sure you honor the visited country with a flag in excellent condition. Some local officials, and local sailors for that matter, will be offended if you display a worn, frayed courtesy flag.
Courtesy flags may also be flown to honor your guests on board, if they have a different nationality than your home country.
Finally, courtesy flags are meant as a clear show of respect, not as a badge of accomplishment. Once you have returned to your home country's waters, do not fly courtesy flags just to let everyone know you have cruised to another country.