"The National Interoperability Field Operations Guide (NIFOG) is a technical reference for radio technicians responsible for radios that will be used in disaster response applications, and for emergency communications planners. The NIFOG includes rules and regulations for use of nationwide and other interoperability channels, frequencies and channel names, and other reference material; formatted as a pocket-sized guide for radio technicians to carry with them. If you are not familiar with interoperability and mutual aid communications, start with the 'How to Use the National Interoperability Field Operations Guide' section. We encourage you to program as many of these interoperability channels in your radios as possible. Even if geographic restrictions on some channels preclude their use in your home area, you may have the opportunity to help in a distant location where the restrictions do not apply. Maximize your flexibility. This version (1.3) contains the information in version 1.2 and all changes issued through March 10, 2009."
North Carolina Department of Health and Human Services: http://www.dhhs.state.nc.us/