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This radio is NOT Part-90 certified as applies to GMRS. For UHF 406.1-480.0 the radio is approved for 5K21F3E (5.21kHz) and, as Axorlov noted, 10K4F3E (10.4 kHz). These correspond to Narrow (6.25kHz) and Wide (12.5) band FM. So, it would, at first, seem this radio might be ok on GMRS. However, In their cover letter BTECH states The Mobile Radio with FCC ID: 2AGNDUV50X3 was designed to operate in the frequency bands 400-480MHz&136-174MHz. To aid equipment authorization in other countries which accept the United States FCC Grant for certification, BTECH (BaoFeng Tech) is requesting that the FCC lists the frequencies 400-480MHz136-174MHz, under FCC Rules Parts 90 on the FCC Grant. BTECH (BaoFeng Tech) attests that the repeater will not be marketed to USA users with the frequency band which is not allowed by the rule part 90. Per the FCC’s KDB634817 guidance, as an alternative to listing the exact frequencies, we acknowledge that it’s a violation of the FCC Rules if this device operates on unauthorized frequencies. Then, in the frequency table attached to that letter UHF: 400-480MHz Frequency Range(MHz) FCC Rule Part 400-406 MHz For Federal 406.1-450 MHz FCC Part 90 450-454 MHz FCC Part 90 456-460MHz FCC Part 90 460-462.5375MHz FCC Part 90 462.7375-467.5375MHz FCC Part 90 467.7357-470MHz FCC Part 90 470-480MHz FCC Part 90 Note, they explicitly exclude GMRS: 462.5500 - 462.7250 & 467.5500 - 467.7250 So, while the UV-50X3 may be freely used on the Ham bands and in Part-90 service on the stated bands, it cannot be used as either a Part-95 radio or a Part-90 radio on GMRS. So, Corey's postulate on Part-90 radios on GMRS would not apply.