Flying international code flags or signal flags
while underway is an age-old nautical tradition. Long before radio
communication, flags were hoisted to send messages to other mariners
or those ashore. Today, while ensign flags and ornamental flags
are common, only a handful of code flags are usually found aboard
recreational vessels. For the most part, code flags are typically
displayed during parades and on special occasions. But these universal
signals of the sea continue to be practical and useful nautical
communicators.
Each letter of the alphabet has a signal flag and
there is a pennant for each number from 0 to 9. There are also answering
and repeater flags available.
Signal flags vary in shape and color some
are square while others are shaped like typical pennants. The combination
of flags hoisted indicates specific nautical conditions or navigational
maneuvers.
For example, hoisting the "A" (Alfa) flag
signals that a diver is down and to keep clear, while flying the
"W" (Whiskey) flag indicates that medical assistance is
needed aboard.
International code flags can also be used to respond
to another vessel. For example, if you see the "QX" flag
combination flying it means the boater is requesting permission
to anchor. Your response may be to raise the "QU" flags
indicating that anchoring is prohibited or the "ZL" which
means the other vessel's signal has been received but it isn't understood.
Here are additional 2-Letter Flag Codes:
AC - I am abandoning my vessel.
AN - A doctor is needed.
BR - A helicopter is needed.
CD - Immediate assistance is needed.
DV - I am drifting.
EF - SOS/MAYDAY is canceled.
FA - Will you give me my position?
GW - Man overboard ... please pick him up.
JL - You are running the risk of going aground.
LO - I am not in my correct position.
RU - Keep clear of me; I have a problem maneuvering.
NC - I am in distress and require assistance.
SO - You should stop your vessel immediately.
PD - Your navigation lights are not visible.
UM - The harbor is closed.
PP - Keep well clear of me.
UP - Permission to enter harbor is urgently requested (emergency).
QD - I am going ahead.
QT - I am going astern.
QQ - I require health clearance.
QU - Anchoring is prohibited.
QX - I request permission to anchor.
YU - I am going to communicate with your station by means of the
international code of signals.
ZL - Your signal has been received but not understood.
While boating in the United States, it is customary
to fly the national "ensign" or American flag, but if
you cross into foreign waters you should be prepared to display
two other flags.
The letter "Q" or quarantine flag should
be hoisted once in foreign waters. The flag should be flown until
you are cleared by customs. The flag of the nation visited should
replace the Q once cleared by customs. This flag is called the "courtesy
flag." Both flags should be hoisted on the starboard spreader
or on the bow.
The National Ensign, of course, is always the first
flag hoisted. It is customary to hoist the national symbol at 8
a.m. and fly it until sunset, unless entering a port when it should
be flown at all times.
The ensign is also flown at the highest point at
the stern of the boat (if you have a gaff-rigged vessel you can
place it at the peak of the raised gaff).
Nautical flags can be purchased individually or
in sets. Signal flag and pennant set prices are determined by the
size of the flags. For example, a full set of 3-foot by 3-foot and
2-foot by 6-foot signal flags cost about $1,000. A 3-foot by 5-foot
National Ensign, however, can be purchased for about $30. Shops
ashore and many online venues sell nautical flags.
Nautical flags are an investment worth protecting
so that you can count on years of use. Treating nautical flags wiith
a quality waterproofing agent will protect them from the degrading
effects of saltwater, dirt and mildew.
Here is a short list of waterproofers available
at some of the specialty marine supply stores: