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Land Mobile Radio Service (LMRS) - ''FCC Title 47 Part 90''; Private land mobile radio systems are used by companies, local governments, and other organizations for communication. Many businesses and industries throughout the world use it as their primary means of communication, especially from a fixed location to mobile units. These licensed systems often share frequencies with other private users in the United States. Land Mobile Radio Service (LMRS) - ''FCC Title 47 Part 90''; Private land mobile radio systems are used by companies, local governments, and other organizations for communication. Many businesses and industries throughout the world use it as their primary means of communication, especially from a fixed location to mobile units. These licensed systems often share frequencies with other private users in the United States. Also referred short as simply LMR, it is denoted as professional mobile radio in North America and private mobile radio In UK. Land mobile radio system is widely utilized for emergency first responder. It can be used in commercial, military, transportation and construction. ==Equipment==Any radio equipment used on LMRS frequencies must be FCC Part 90 certified. There's plenty of ham radio equipment that is capable of operation on LMRS frequencies, at wide and narrow band. Previously ham equipment had to be specially modified to operate out of ham radio bands on frequencies such as LMRS. With the introduction of new, low cost, non-FCC compliant Chinese ham gear there are a number of radios that can operate on LMRS and public safety frequencies without modification. It is not legal to use these radios on LMRS frequencies.Volunteer firefighters that also hold a ham radio license often mistakenly program their mobile ham radios to operate on emergency responder frequencies that they, as an individual are authorized to use. However, even though the individual is authorized, the use of a non-FCC Part 90 certified radio is not lawful. These public safety officials using non-certified radios instead of their assigned Part 90 radios are subject to fines and penalties from the FCC. There is only one exception to the rule with very narrow and specific requirements that does not apply to normal use and in the event that there is absolutely no other means of communication available and as only a last resort, which applies to any operator.