A courtesy flag (or courtesy ensign) is flown by a ship in foreign waters as a token of respect by a vessel that is visiting. It is often a small (i.e. smaller than the ship's own national ensign) national maritime flag of the host country, although there are countries (such as
The flag is customarily worn at the fore-masthead of multi-masted vessels, the starboard yardarm or crosstree of the mast of single-masted vessels, and from the bow staff of vessels without masts.
Each one measures 12 x 18".
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