One important distinction between these systems is the amount of data transmitted by each radio when the operator pushes the PTT button.
In Type I systems, each radio in the trunk group individually transmits its own affiliation.
The police might decide to further divide its fleet into subfleets, such as dispatch, tactical operations, detectives, north, south, east and west side patrols and supervisors.
Determining the exact fleet-subfleet hierarchy for a particular area is referred to as fleet map programming.
This is three times the amount of data a Type II system radio sends.