In APCO 10-codes, 10-77 refers to "ETA (Estimated Time of Arrival)."
This code is used to communicate the expected arrival time of a unit or individual to a specific location. It's particularly useful in situations where timing is crucial, such as emergencies or coordinated operations, allowing dispatchers and other units to know when assistance or backup will arrive.
For example, a typical exchange might look like this:
- Dispatcher: "Unit 3, can you provide your 10-77 for the scene?"
- Unit 3: "My 10-77 is approximately 5 minutes."
Using 10-77 helps maintain effective communication regarding timing and enhances overall situational awareness during responses to incidents.