| Code | Meaning |
|---|---|
| 10-1 | Receiving poorly. |
| 10-2 | Receiving well. |
| 10-3 | Stop transmitting. |
| 10-4 | Message received and understood (acknowledgment). |
| 10-5 | Relay message. |
| 10-6 | Busy, stand by. |
| 10-7 | Out of service. |
| 10-8 | In service. |
| 10-9 | Repeat message. |
| 10-10 | Negative (no). |
| 10-20 | Location. |
| 10-21 | Call by telephone. |
| 10-22 | Disregard the last transmission. |
| 10-23 | Stand by at this location. |
| 10-24 | Send help immediately. |
| 10-27 | Driver’s license check. |
| 10-28 | Vehicle registration check. |
| 10-29 | Check for wanted persons (criminal background check). |