Nautical flag poles are used to fly international code flags that are used between two ships at sea, or between a ship and people on shore like maybe a harbor master.
These flags are called signaling flags. There are sets of flags of different colors, shapes and markings. Use of these flags in combination or singly. The sets use 26 square flags each one represents a letter of the alphabet, ten numeral flags and three substitutes or repeaters.
Go on line and check out the information and pictures of nautical poles. These poles are designed to meet marine and pool side use. They generally have a yardarm that lets you display three flags on one pole.
You can choose either aluminum or fiberglass flag poles. You will want to check the price differences. If this is the first flag pole you are buying go on line and compare prices. Consider talking to other boaters about their preferences on which mast is better, fiberglass or aluminum, and why. Wooden flag poles for your boat can rot or snap in high winds.
Aluminum is an alloy of two metals. You should check for anodized or cast aluminum so that your pole doesn’t get pitted, especially if your use your boat in the ocean. Fiberglass is very strong, does not rot or pit and usually doesn’t stain.
Besides a national flag, ships sometimes use flags to communicate with other ships. This could be to send messages like “I have a diver down keep well clear at slow speed.” “I am taking in, discharging or carrying dangerous cargo.” “You are running into danger” or “You should stop immediately.” These are only a few meanings for the language of nautical flags flown from flag poles.