Copy That
Radio confirmation used on film sets to acknowledge a received and understood message.
Copy That
phrase | Production
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 confirm three things: 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
| Also Known As | "Copy," "10-4," "Roger," "Received" |
| Domain | Production |
| Also Used In | Live event production, broadcast television, concert touring |
| Related Terms | 10-1, What's Your 20?, Crossing, Striking, Production Assistant |
| See Also (Tools) | Shot List Generator |
| Difficulty | Foundational |
The Explanation: How & Why
Every film set runs on radio communication. The 1st AD, department heads, production assistants, and key crew are all on the same channel (or on assigned channels for larger productions), sending and receiving messages constantly throughout the shooting day. Without confirmation that a message has been received, the sender cannot know whether their instruction has been heard and will be acted on. "Copy that" closes that loop in three syllables.
The phrase carries three pieces of information simultaneously:
- Reception confirmed: The transmission was received without interference or signal loss.
- Content understood: The message's meaning was clear and has been processed.
- Action implied: The recipient will act on the instruction without needing further follow-up from the sender.
The efficiency matters. A 1st AD calling "Camera department, we are moving to the next setup in five minutes" needs to know the camera department heard it. "Copy that" confirms receipt without clogging the channel with longer responses. Without it, radio traffic would fill with follow-up confirmations and repeated transmissions.
"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 closes the communication loop falsely and can result in instructions not being carried out. The correct response to an unclear transmission is "Say again" or "Go again," the radio protocol equivalent of "Please repeat."
For planning the setups that generate these radio calls, use the Shot List Generator to build your day's shot sequence in advance.
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 two-way radios as standard set infrastructure during the 1970s and 1980s brought these terms with them, and they have remained standard professional vocabulary on American film and television sets ever since. The FCC's radio operating rules formalized many of the procedural words used in civilian radio communication, though film sets have developed their own production-specific vocabulary on top of that foundation.
How It's Used in Practice
Scenario 1 - 1st AD Instruction (1st AD / Camera Department): The 1st AD radios on Channel 1: "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. The setup switch happens on schedule without a second radio call.
Scenario 2 - Location Communication (PA / 1st AD): A PA stationed at base camp two blocks 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 starts the countdown to the actors' arrival and alerts the hair and makeup trailer.
Scenario 3 - New Crew Correction (1st AD / PA): A first-day production assistant responds to a radio instruction with "OK" instead of "Copy that." The 1st AD corrects them between takes: "On radio, the acknowledgement is 'Copy that,' not 'OK.' 'OK' can get confused with other transmissions. 'Copy that' is clear and unambiguous." The PA adjusts immediately. Radio protocol is part of professional set etiquette, and learning it is one of the first tasks for any new crew member.
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 the military phonetic alphabet (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 as their standard, and the 1st AD sets the tone.
"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 on most sets.
"Copy That" vs. "Standing By": "Copy that" confirms receipt of a message. "Standing by" means the recipient is ready and waiting for further instructions. A PA who says "copy that" to a "hold for setup" message is confirming they heard it. A PA who says "standing by" is confirming they heard it AND are in position and ready. The distinction matters when the 1st AD is tracking who is ready to go.
Variations by Context
| Context | How Usage Varies |
|---|---|
| US Film Sets | "Copy that" or "Copy" is the dominant acknowledgement. "10-4" is also common. "Roger" is less frequent but understood. |
| UK Film Sets | "Copy" is widely used, but some crews prefer "Received" or "Roger that." The terminology is converging as US and UK productions increasingly overlap. |
| Large Budget / Studio | Channel discipline is strict. Channel 1 is for production only. Longer conversations move to Channel 2. Each department has its own channel (typically 3 for transportation, 5 for props, 6 for camera, 7 for electric, 8 for grip). |
| Independent / Low Budget | All departments may share a single channel. "Copy that" is still the standard acknowledgement, but channel discipline is looser and radio traffic is heavier. |
Key People & Films
The 1st AD is the primary user of radio protocol on any set, and the quality of a 1st AD's radio communication is a measurable professional skill. DGA training programs include radio communication protocol as part of their curriculum. The 1992 film Noises Off features a comedic depiction of backstage communication breakdowns that illustrates what happens when radio protocol fails. More authentically, the documentary Cameraperson (2016) by Kirsten Johnson captures the radio chatter of a working camera department across multiple productions, showing how "copy that" functions as the connective tissue of set communication.
Equipment / Tools Reference
Motorola CLS1110 and CLS1410 UHF two-way radios are the most common walkie-talkies on American film sets. The Motorola CP200d is the standard upgrade for larger productions requiring digital clarity and multi-channel capacity. Earpieces (typically D-ring acoustic tube earpieces) are standard for all crew on set to keep radio traffic off the production audio. StudioBinder and Movie Magic Scheduling generate call sheets that include the daily channel assignments.
Standards & Specifications
The FCC Part 95 rules govern the use of General Mobile Radio Service (GMRS) and Multi-Use Radio Service (MURS) frequencies used by most film set walkie-talkies. Motorola CLS-series radios operate on 462.5625 to 467.7125 MHz UHF frequencies under Part 95. The APCO 10-codes (10-1, 10-4, 10-20, etc.) that film sets adapted from law enforcement are not formally standardized by the FCC but follow the APCO standard commonly used in public safety communication. No formal industry standard governs film-specific radio vocabulary, but the conventions described here are consistent across virtually all professional US productions.
Common Questions / FAQ
Q: What do you say when you did not hear the full message?
A: Say "Go again" or "Say again." Never say "copy that" to a message you did not fully hear or understand. "Say again" is the standard radio protocol term for requesting a repeat. The sender will retransmit the full message. Saying "copy that" to an incomplete message creates a false confirmation that can lead to missed instructions.
Q: What channel should I be on?
A: Check the daily call sheet for channel assignments. Channel 1 is almost always the main production channel where the 1st AD runs the set. Typical assignments: Channel 2 for open conversation, Channel 3 for transportation, Channel 5 for props, Channel 6 for camera, Channel 7 for electric, Channel 8 for grip. If you need to have a longer conversation, ask the other person to switch to Channel 2.
Q: Is "copy" the same as "10-4"?
A: Yes, in practice. Both mean "message received and understood." "10-4" comes from the APCO 10-code system used in law enforcement. "Copy" comes from military radio operators who literally copied messages by hand. On film sets, both are used interchangeably, though "copy" or "copy that" is more common in contemporary usage.
Related Terms
- 10-1 - A radio code for bathroom break, adopted from the same 10-code system as 10-4
- What's Your 20? - A radio code asking for a crew member's location, from the 10-code 10-20
- Crossing - An on-set call that warns of equipment movement through the frame area, requiring "copy that" acknowledgement from affected crew
- Striking - An on-set call warning that equipment is being removed, requiring "copy that" from anyone in the area
- Production Assistant - The crew role most frequently using "copy that" in radio communication with the 1st AD
- Call Sheet - The daily document that includes radio channel assignments for all departments
See Also / Tools
The Shot List Generator builds the shot sequence that drives the 1st AD's radio calls throughout the day. Each time the AD calls a move to the next setup, the crew's "copy that" responses confirm the coordinated movement will happen. For more on set communication protocols, see the blog post on film set etiquette for new crew members.
