I live in another part of Michigan, but visit up there occasionally. The following is what I have been told. I am not sure if this only applies to fire and EMS or not. I would be interested if you are able to obtain further:
Radio Id’s determined thru 911 dispatch center.
- First digit = County, 3 – Emmet, 4 - Cheboygan, 5 - Charlevoix
- Second digit = Local government identifier within county
- Charlevoix county (5):
- 3 = Charlevoix City
- 7 = Beaver Island
- Last two digits = type of vehicle
- 01, 02 … = fire trucks
- 21, 22 … = rescue or first response vehicles
- A1, A2 … = Ambulance
- Examples:
- 5701, Charlevoix County, Beaver Island, Truck #1
- 57A1, Charlevoix County, Beaver Island, Ambulance 1
- 53A2, Charlevoix County, Charlevoix City, Ambulance 2