9. Numeral group: One or more numerals.
Definitions of the following terms agree in
meaning with allied signaling instructions:
METHODS OF SIGNALING
The methods of signaling that may be used are as
Flashing light signaling
Voice over a loud hailer
Signaling by hand flags or arms
The international flagbag consist of 40 flags: 26
alphabetical flags, 10 numeral pennants, 3 substitutes,
and the ANSWER pennant.
Flashing Light and Sound Signaling
The Morse symbols representing letters and
numerals are signaled as in any other form of Navy
In flashing light and sound signaling, it is best to
err on the side of making the dots shorter in their
proportion to the dashes. The distinction between the
elements is then clearer. The standard rate of signaling
by flashing light is 40 letters per minute.
Voice Over a Loud Hailer
Whenever possible, plain language should be used
where a language difficulty exists; groups from the
International Code of Signals could be transmitted
using the phonetic spelling tables.
Radiotelegraph and Radiotelephone
When radiotelegraph or radiotelephone is used for
the transmission of signals, operators should comply
with the Radio Regulations of the International
Telecommunications Union in force at that time.
Unless otherwise indicated, all signals between
vessels are made from the master (or commanding
officer) of the vessel of origin to the captain of the
vessel of destination.
Identification of Ships and Aircraft
Identity signals for ships and aircraft are allocated
on an international basis. The identity signals may
therefore indicate the nationality of a ship or aircraft.
Use of Identity Signals
Identity signals may be used for two
1. To speak to, or call, a station
2. To speak of, or indicate, a station
YP LABCI wish to communicate with vessel
. (Complements Table 1, chapter 2,
HY 1 LABCThe vessel LABC with which I have
been in collision has resumed her voyage.
Names of Vessels and/or Places
Names of vessels and/or places are spelled out, as
RV GIBRALTARYou should proceed to
IT2 SS MICHIGANSS Michigan is on fire.
How to Signal Numbers
Numbers are signaled as follows:
Flag signaling: By the numeral pennants of the