Harford uses a combination of their old infrastructure, old channels, and channels they licensed as a CMARC partner for their local public safety communications needs. CMARC was intended as a regional interoperability network built for mobile coverage, but FIRST has basically supplanted it with statewide portable on-street coverage, rendering CMARC essentially redundant. Not sure if Harford has their own core and uses the CMARC core as a backup.