OSH Security Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

The code used when you need the dispatcher to repeat their transmission is 10-9. This code is specifically meant to indicate that the communication was not clear or understood, prompting a repetition for clarification. In communication protocols, especially in radio communications, clarity is crucial for effective response and situational awareness. By using 10-9, the listener communicates explicitly that they require the information to be restated, ensuring that misunderstandings can be avoided.

Other codes serve different purposes. For example, 10-78 typically indicates a request for assistance, which does not address a misunderstanding of transmission. Similarly, 10-99 is used to indicate a wanted or stolen vehicle, and 10-4 simply acknowledges that a message has been received and understood. This distinction of purpose highlights why 10-9 is the correct choice in scenarios where clarity of communication is needed.