APRS provides a way to share information between many radio operators using packet radio. This information includes position, status, messaging, weather, and telementry. The possibilities are nearly endless.
APRS is commonly heard in many areas on 144.390 simplex. It is sometimes heard on the UHF equivilent on 446.925 simplex. The Hamilton County area is blessed with many digipeaters. These "digital repeaters" rebroadcast information to a wider geographical area.