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What Does '10-4' Mean?

Published in Radio Communication 1 min read

The phrase '10-4' is a well-known radio code that signifies "Okay" or "understood." It acts as a concise and clear confirmation that a message has been received and comprehended.

Primary Usage and Context

Primarily, the 10-4 code is widely used by police officers across North America. It is a fundamental part of a standardized system known as '10-codes,' designed to streamline radio communications. These codes enable law enforcement personnel to transmit common messages quickly and unambiguously, which is crucial for efficient operations and coordination, especially in time-sensitive situations.

Origins of the 10-Code System

The system of '10-codes,' including 10-4, was developed during the 1930s. The main objective behind their creation was to allow for the standardization of message traffic over radio channels. By using numerical codes for frequently used phrases, communication became more efficient, reduced the need for lengthy explanations, and minimized potential misunderstandings among different agencies and officers. This standardization significantly improved the clarity and speed of radio transmissions in critical fields.