| Standard APCO 10 Codes |
| 10-1 | Cannot understand your message |
| 10-2 | Your signal is good |
| 10-3 | Stop transmitting |
| 10-4 | Message recieved ("OK") |
| 10-5 | Relay information to _________ |
| 10-6 | Station is busy |
| 10-7 | Out of service |
| 10-8 | In service |
| 10-9 | Repeat last message |
| 10-10 | Negative ("no") |
| 10-11 | __________ in sevice |
| 10-12 | Stand by |
| 10-13 | Report __________ conditions |
| 10-14 | Information |
| 10-15 | Mesage delivered |
| 10-16 | Reply to message |
| 10-17 | En route |
| 10-18 | Urgent |
| 10-19 | Contact __________ |
| 10-20 | Unit location |
| 10-21 | Call __________ by telephone |
| 10-22 | Cancel last message |
| 10-23 | Arrived at scene |
| 10-24 | Assignment completed |
| 10-25 | Meet __________ |
| 10-26 | Estimated time of arrival is _________ |
| 10-27 | Request for information on license |
| 10-28 | Reques vehicle registration information |
| 10-29 | Check records |
| 10-30 | Use caution |
| 10-31 | Pick up |
| 10-32 | Units requested |
| 10-33 | Emergency! Clear the air |
| 10-34 | Correct time |