In APCO 10-codes, 10-9 means "Repeat."
This code is used to request that a message or transmission be repeated for clarity. It is particularly useful in situations where communication may have been unclear or when background noise interferes with the message being received. For example:
- Officer: "Dispatch, 10-9 that last transmission."
Using 10-9 helps ensure that critical information is accurately communicated, minimizing misunderstandings and enhancing operational effectiveness.