These frequencies are not covered by the blanket authorization for nationwide interoperability channels, and a valid FCC license is required for them. These are common channels for EMS and hospitals to use for communications. They have also been known to be used for mass casualty incidents. In some areas, organized EMS dispatch centers will use this plan for dispatching and coordinating EMS and hospital resources. PL tone(s) vary by agency and location. Frequencies ending in .xxx5 (12.5 kHz channel centers) must not exceed 11.25 kHz bandwidth (narrowband). Frequencies ending in .xxxx5 (6.25 kHz channel centers) must not exceed 6 kHz bandwidth (ultra-narrowband). Med channels 9/91/92/93, 10/101/102/103 are typically used for dispatching and/or mutual aid. Med 1-10 are the original med channels prior to adding in the 6.25 spaced channels.