What does 10-4 mean?

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Multiple Choice

What does 10-4 mean?

Explanation:
The main idea is radio communication shorthand. 10-4 is an acknowledgment that a message was received and understood. When one person gives instructions, replying with 10-4 lets the sender know you heard them and know what to do next. It’s not about the quality of the radio signal (that would be “signal good”) or about whether you’re available (that would be “in service” or “busy”). Some agencies now use plain language, but the sense of 10-4 as “I copy that” or “affirmative” remains commonly understood.

The main idea is radio communication shorthand. 10-4 is an acknowledgment that a message was received and understood. When one person gives instructions, replying with 10-4 lets the sender know you heard them and know what to do next. It’s not about the quality of the radio signal (that would be “signal good”) or about whether you’re available (that would be “in service” or “busy”). Some agencies now use plain language, but the sense of 10-4 as “I copy that” or “affirmative” remains commonly understood.

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