Classified information may not be discussed in
telephone conversations except as may be authorized
over approved secure communications circuits.
When in doubt about the classification of information
necessary to answer a question asked in a telephone
conversation, you should say nothing. When
a n s w e r i n g
a
t e l e p h o n e
o n
a
n o n s e c u r e
communications circuit, you should inform the caller
that the telephone is nonsecure. For example:
“Quarterdeck, USS Never Sail messenger of the
watch speaking, sir this is a nonsecure telephone.”
ANNOUNCING AND
INTERCOMMUNICATION SYSTEMS
Learning Objective: When you finish this chapter, you
will be able to—
R e c o g n i z e t h e p u r p o s e a n d u s e o f t h e
announcing and intercommunication systems.
The general purpose of shipboard announcing and
intercom systems, circuits 1MC through 59MC, is to
transmit orders and information between stations within
the ship by amplified voice communication by either a
central amplifier system or an intercommunication
4-13
Student Notes:
Figure 4-8.—Network terminal.
