Which device can identify the location of apparatus based on global positioning system (GPS) signals and provides a graphic display to the computer-aided dispatch system?

The automatic vehicle location system is designed specifically to utilize global positioning system (GPS) signals for identifying the precise location of vehicles, such as fire apparatus. By linking GPS data with a computer-aided dispatch system, this technology provides real-time tracking of fire engines, ambulances, and other emergency vehicles. This capability enhances operational efficiency by allowing dispatchers to view vehicle locations on a map and make informed decisions about resource deployment based on proximity to incidents.

The other devices mentioned do not possess the same functionality. A radio communications system is primarily used for communication among personnel, rather than for tracking locations. An emergency response tracker may imply a system for monitoring response times or logistical metrics but does not inherently have the GPS capabilities tied specifically to vehicle tracking. Similarly, a dispatch locator may refer to a tool used in dispatching but lacks the specialized integration with GPS technology that is characteristic of an automatic vehicle location system. Thus, the automatic vehicle location system stands out as the correct answer due to its specific role and capabilities.