Two-letter signals for General Signal Code examples are listed below as they relate to maneuvers. Single-letter signals should be allocated to significations which are very urgent, important, or of very common use. For web page layout purposes the signal flags are shown here horizontally. As a general rule only one hoist should be shown at a time. Each hoist or group of hoists should be kept flying until it has been answered by the receiving station. When more groups than one are shown on the same halyard they must be separated by a tackline. The transmitting station should always hoist the signal where it can be most easily seen by the receiving station, that is, in such a position that the flags will blow out clear and be free from smoke. A more complete list of two-letter codes is shown in Chapter 2, Section IV of the International Code of Signals.
Two-letter signals for General Signal Code examples
Note: Two-letter codes use compliments. That's basically a number that provides a variation of meaning within a certain group.
Code
Meaning
QD
I am going ahead.
QG
You should go ahead.
QI
I am going astern.
QN
You should come alongside my starboard side.
QN 1
You should come alongside my port side.
QP
I will come alongside.
QS 1
You should anchor (position to be indicated if necessary).
QV
I am anchoring in position indicated.
RA
My anchor is foul.
Code
Meaning
RC
I am (or vessel indicated is) breaking adrift.
RK
My engines will be ready at time indicated.
RO
Propeller shaft is broken.
RP
Landing here is highly dangerous.
RV
You should proceed (to place indicated if necessary).
SC
I am underway.
SG
My present speed is… (number) knots.
SN
You should stop immediately. Do not scuttle. Do not lower boats. Do not use the wireless. If
you disobey I shall open fire on you.