GMRS
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The General Mobile Radio Service (GMRS) is a North American land-mobile FM UHF radio service designed for short-distance two-way communication. It is commonly used on live steam railroads for dispatcher to engineer, or engineer to engineer communications.
Unlike FRS, GMRS requires a license in United States but can be used license-free in Canada. GMRS radios include the channels of FRS and can be used together.