Classified information may not be discussed intelephone conversations except as may be authorizedover approved secure communications circuits.When in doubt about the classification of informationnecessary to answer a question asked in a telephoneconversation, you should say nothing. Whena 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 ecommunications circuit, you should inform the callerthat the telephone is nonsecure. For example:“Quarterdeck, USS Never Sail messenger of thewatch speaking, sir this is a nonsecure telephone.”ANNOUNCING ANDINTERCOMMUNICATION SYSTEMSLearning Objective: When you finish this chapter, youwill 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 eannouncing and intercommunication systems.The general purpose of shipboard announcing andintercom systems, circuits 1MC through 59MC, is totransmit orders and information between stations withinthe ship by amplified voice communication by either acentral amplifier system or an intercommunication4-13Student Notes:Figure 4-8.—Network terminal.
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