Copy That

Copy That

exclamation | Production & On-Set

A radio communication term used on film and television sets to confirm that a transmitted message has been received and understood. When a crew member or the 1st AD sends a message over the radio and the recipient says "Copy that" (or simply "Copy"), they are confirming: the message was received clearly, the information has been understood, and no clarification is needed. It is the standard acknowledgement in film set radio communication, adopted from military and emergency services radio protocol.

Quick Reference

The Explanation: How & Why

Film sets operate through continuous radio communication between the 1st AD, department heads, production assistants, and key crew. Every department is on the same channel (or on assigned channels for larger productions), and messages are sent and received constantly throughout the shooting day. In this environment, confirmation that a message has been received is essential — without it, the sender cannot know whether their instruction has been heard and will be acted on.

"Copy that" provides that confirmation in a single, efficient phrase. It carries three pieces of information simultaneously:

1. Reception confirmed: The transmission was received without interference or signal loss.
2. Content understood: The message's meaning was clear and has been processed.
3. Action implied: The recipient will act on the instruction (if an instruction was given) without needing further follow-up from the sender.

Origins in military and emergency services:

"Copy" as a radio acknowledgement comes from military communications, where it indicated that a message had been "copied" (received and recorded). The military and law enforcement radio protocol that used "copy," "roger," and "10-4" as acknowledgement terms was adopted by CB radio culture in the 1970s and subsequently by film production radio communication. On contemporary sets, "copy," "copy that," and "10-4" are all used interchangeably; "roger" is less common but still heard.

Practical use on set:

A 1st AD calling over the radio: "Camera department, we are moving to the next setup in five minutes." The camera department head responds: "Copy that." The 1st AD knows the message was received and can proceed without repeating it or checking in further.

A production assistant locates a missing prop and radios: "Found the umbrella — it is at the props truck." The props department head responds: "Copy that, I am coming to you." The PA knows the information has been received and their task is complete.

The efficiency of "copy that" is significant — it closes the communication loop in three syllables. Without it, radio traffic would be filled with follow-up confirmations and repeated transmissions.

When not to use it:

"Copy that" should not be used when the message was not actually understood or when clarification is needed. Saying "copy that" to a message that was unclear or not fully received closes the communication loop falsely and can result in instructions not being carried out. The correct response to an unclear transmission is "Say again" (the radio protocol equivalent of "Please repeat").

Historical Context & Origin

The term comes directly from military radio communication, where operators who received and transcribed (copied) a message would confirm receipt with "copy" or "copies received." This usage spread through CB radio culture in the United States during the 1970s and into professional radio communication contexts including film production. The adoption of radio communication as standard set infrastructure during the 1970s and 1980s brought these terms with it, and they have remained standard professional vocabulary on American film and television sets since.

How It's Used in Practice

Scenario 1 -- 1st AD Instruction (1st AD / Camera Department): The 1st AD radios: "We are moving to B camera for the insert shots in ten minutes — please be ready." The camera operator responds: "Copy that." The 1st AD marks the acknowledgement mentally and continues coordinating the rest of the set, confident the camera department has received the instruction.

Scenario 2 -- Location Communication (Production Assistant / 1st AD): A PA stationed at the base camp two blocks away from the shooting location radios: "The talent is in the car — ETA to set is three minutes." The 1st AD responds: "Copy that — we will be ready." The PA knows the information was received; the 1st AD knows to expect the actors in three minutes.

Scenario 3 -- New Crew Correction (1st AD / PA): A new production assistant responds to a radio instruction with "OK" instead of "Copy that." The 1st AD gently corrects them between takes: "On radio, the acknowledgement is 'Copy that' — not 'OK.' 'OK' can get confused with other transmissions. 'Copy that' is clear." The PA adjusts immediately. Radio protocol is part of professional set etiquette.

Usage Examples in Sentences

"Moving to the next setup in five minutes." "Copy that."

"The generator is running low on fuel — can someone check on it?" "Copy that — sending someone now."

"Do not just say 'OK' on the radio. Say 'Copy that.' It is clearer and more professional."

"Copy that is three syllables. It closes the loop and tells the sender their message was received. That is all it needs to do."

Common Confusions & Misuse

"Copy That" vs. "Roger": Both mean "message received and understood." "Roger" comes from military phonetic alphabet usage (R for "received") and is slightly more formal in tone. "Copy" or "Copy that" is more common in contemporary film set usage. Either is understood and professionally acceptable; productions generally settle on one or the other as their standard.

"Copy That" vs. "Affirmative": "Affirmative" means "yes" — it is the answer to a yes/no question. "Copy that" means "message received" — it is an acknowledgement of any type of transmission, not specifically a yes/no answer. Using "affirmative" to acknowledge a non-question transmission is technically incorrect radio protocol, though it is understood.

Related Terms

• 10-1 -- Another radio code term adopted from law enforcement and CB radio culture; means bathroom break needed
• What's Your 20? -- A related radio code asking for a crew member's location; a question that typically receives a location answer followed by "copy that"
• Crossing -- An on-set radio call that also requires "copy that" acknowledgement from anyone in the affected area
• Striking -- An on-set radio call about equipment that similarly uses "copy that" for acknowledgement
• Production Assistant -- Often the crew member most frequently using "copy that" in radio communication with the 1st AD

See Also / Tools

The Shot List Generator underlies the instructions that generate "copy that" acknowledgements — each time the 1st AD calls a move to the next setup on the shot list, the crew's "copy that" responses are the confirmation that the coordinated movement will happen.