Visual Signaling in General.

21. Methods of visual signaling are divided as follows:

(a) By flag, torch, hand lantern, or beam of searchlight (without shutter). (General Service Code).

(b) By heliograph, flash lantern, or searchlight (with shutter). (General Service Code).

(d) By hand flags or by stationary semaphore. (Two-arm semaphore Code.)

(e) By preconcerted signals with Coston lights, rockets, bombs, Very pistols, small arms, guns, etc.

(f) By flag signals by permanent hoists. (International Code.)

22. The following conventional signals, with exceptions noted, will be used in the first four classes.

		Exceptions
		Ardois and semaphore.
End of word.	Interval.
End of sentence.	Double interval.
End of message.	Triple interval.
Signal separating preamble from address; address from text; text from signature.	- . . . -	Double interval, signature preceded also by "Sig." Interval.
Acknowledgement.	R.
Error.	. . . . . . . .	A.
Negative.	K.
Preparatory.	L.
Annulling.	N.
Affirmative.	P.
Interrogatory.	. . - - . .	O.
Repeat after word.	Interrogatory. A (word).
Repeat last message.	Interrogatory three times.
Send faster.	QRQ.
Send slower.	QRS.
Cease sending.	QRT.
Wait a moment.	. - . . .	None.
Execute.	IX, XI.
Move to your right.	MR.
Move to your left.	ML.
Move up.	MU.
Move down.	MD.
Finished (end of work).	. . . - . -	None.